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• APA Referencing (7th Ed.) Quick Guide | In-text Citations & References

APA Referencing (7th Ed.) Quick Guide | In-text Citations & References

Published on 18 January 2021 by Raimo Streefkerk . Revised on 17 January 2024.

This citation guide outlines the most important citation guidelines from the 7th edition APA Publication Manual (2020). Scribbr also offers free guides for the older APA 6th edition , MLA Style , and Chicago Style .

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Table of contents

Apa in-text citations, apa references, formatting the apa reference page, free lecture slides.

In-text citations are brief references in the running text that direct readers to the reference entry at the end of the paper. You include them every time you quote or paraphrase someone else’s ideas or words.

An APA in-text citation consists of the author’s last name and the year of publication (also known as the author-date system). If you’re citing a specific part of a source, you should also include a locator such as a page number or timestamp. For example: (Smith, 2020, p. 170) .

Parenthetical vs. narrative citation

The in-text citation can take two forms: parenthetical and narrative. Both types are generated automatically when citing a source with Scribbr’s APA Citation Generator.

• Parenthetical citation: According to new research … (Smith, 2020) .
• Narrative citation: Smith (2020) notes that …

Multiple authors and corporate authors

The in-text citation changes slightly when a source has multiple authors or an organization as an author. Pay attention to punctuation and the use of the ampersand (&) symbol.

Missing information

When the author, publication date or locator is unknown, take the steps outlined below.

Prevent plagiarism, run a free check.

APA references generally include information about the author , publication date , title , and source . Depending on the type of source, you may have to include extra information that helps your reader locate the source.

Reference examples

Citing a source starts with choosing the correct reference format. Use Scribbr’s Citation Example Generator to learn more about the format for the most common source types. Pay close attention to punctuation, capitalization, and italicization.

Generate APA citations for free

It is not uncommon for certain information to be unknown or missing, especially with sources found online. In these cases, the reference is slightly adjusted.

On the first line of the page, write the section label “References” (in bold and centred). On the second line, start listing your references in alphabetical order .

Apply these formatting guidelines to the APA reference page:

• Double spacing (within and between references)
• Hanging indent of ½ inch
• Legible font (e.g. Times New Roman 12 or Arial 11)
• Page number in the top-right header

Which sources to include

On the reference page, you only include sources that you have cited in the text (with an in-text citation ). You should not include references to personal communications that your reader can’t access (e.g. emails, phone conversations or private online material).

Are you a teacher or professor looking to introduce your students to APA Style? Download our free introductory lecture slides, available for Google Slides and Microsoft PowerPoint.

Open Google Slides Download PowerPoint

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Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

Streefkerk, R. (2024, January 17). APA Referencing (7th Ed.) Quick Guide | In-text Citations & References. Scribbr. Retrieved 29 April 2024, from https://www.scribbr.co.uk/referencing/apa-style/

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APA 7th Edition Citation Guide

• APA 7th Edition Home
• Formatting the Paper Itself
• When and What to Cite
• In-Text: Multiple Authors
• In-Text: First and Subsequent Citations
• In-Text: Authors and Dates Matching
• In-Text: Direct Quotations
• In-Text: Secondary Sources
• Reference Examples: Print
• Reference Examples: Electronic
• Reference Examples: Audiovisual Media
• Step 1: Author (Names)
• Step 2: Date
• Step 3: Titles
• Step 4: Source
• Help and Training
• Related Guides

This citation guide is based on The Publication Manual of the American Psychological Association  (7th ed., 2020). The contents are accurate to the best of our knowledge.

Content in this guide was copied with permission from Bethel University (TN) Library .

Reference Examples

Your references should begin on a new page separate from the text of the essay; label this page "References" centered at the top of the page in bold. All text should be double-spaced just like the rest of your essay.

Basic Rules

• All lines after the first line of each entry in your reference list should be indented 1/2-inch from the left margin. This is called hanging indentation. You can set up Word to do this automatically.
• If there are 21 or more authors, list the first 19 authors and insert an ellipsis. After the ellipsis, then add the final author's name.
• Reference list entries should be alphabetized by the last name of the first author of each work.
• For multiple articles by the same author (or authors listed in the same order), list the entries in chronological order, from earliest to most recent.
• Present the journal title in full.
• ReCALL , not RECALL
• Knowledge Management Research & Practice , not Knowledge Management Research and Practice
• When referring to the titles of books, chapters, articles, or webpages, capitalize only the first letter of the first word of a title and subtitle, the first word after a colon or a dash in the title, and proper nouns.
• Note that the distinction here is based on the type of source being cited. Academic journal titles have all major words capitalized, while other sources' titles do not.
• Italicize titles of longer works such as books and journals.
• Do not italicize, underline, or put quotes around the titles of shorter works such as journal articles or essays in edited collections.

From the APA Style Blog

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Format Your Paper & Cite Your Sources

• APA Style, 7th Edition
• Citing Sources
• Avoid Plagiarism
• MLA Style (8th/9th ed.)

APA Tutorial

Formatting your paper, headings organize your paper (2.27), video tutorials, reference list format (9.43).

• Elements of a Reference

Reference Examples (Chapter 10)

Dois and urls (9.34-9.36), in-text citations.

• In-Text Citations Format
• In-Text Citations for Specific Source Types

NoodleTools

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What is APA Style?

APA style was created by social and behavioral scientists to standardize scientific writing. APA style is most often used in:

• psychology,
• social sciences (sociology, business), and

If you're taking courses in any of these areas, be prepared to use APA style.

For in-depth guidance on using this citation style, refer to Publication Manual of the American Psychological Association , 7th ed. We have several copies available at the MJC Library at the call number  BF 76.7 .P83 2020 .

APA Style, 7th ed.

In October 2019, the American Psychological Association made radical changes its style, especially with regard to the format and citation rules for students writing academic papers. Use this guide to learn how to format and cite your papers using APA Style, 7th edition.

You can start by viewing the  video tutorial .

For help on all aspects of formatting your paper in APA Style, see   The Essentials  page on the APA Style website.

• sans serif fonts such as 11-point Calibri, 11-point Arial, or 10-point Lucida Sans Unicode, or
• serif fonts such as 12-point Times New Roman, 11-point Georgia, or normal (10-point) Computer Modern (the default font for LaTeX)
• There are exceptions for the  title page ,  tables ,  figures ,  footnotes , and  displayed equations .
• Margins :  Use 1-in. margins on every side of the page.
• Align the text of an APA Style  paper to the left margin . Leave the right margin uneven, or “ragged.”
• Do not use full justification for student papers.
• Do not insert hyphens (manual breaks) in words at the end of line. However, it is acceptable if your word-processing program automatically inserts breaks in long hyperlinks (such as in a DOI or URL in a reference list entry).
• Indent the first line of each paragraph of text 0.5 in . from the left margin. Use the tab key or the automatic paragraph-formatting function of your word-processing program to achieve the indentation (the default setting is likely already 0.5 in.). Do not use the space bar to create indentation. 
• There are exceptions for the  title page ,  section labels ,  abstract ,  block quotations ,  headings ,  tables and figures ,  reference list , and  appendices .

Paper Elements

Student papers generally include, at a minimum: 

• Title Page (2.3)
• Text (2.11)
• References  (2.12)

Student papers may include additional elements such as tables and figures depending on the assignment. So, please check with your teacher!

Student papers generally  DO NOT  include the following unless your teacher specifically requests it:

• Running head
• Author note

For complete information on the  order of pages , see the APA Style website.

Number your pages consecutively starting with page 1. Each section begins on a new page. Put the pages in the following order:

• Page 1: Title page
• Page 2: Abstract (if your teacher requires an abstract)
• Page 3: Text 
• References begin on a new page after the last page of text
• Footnotes begin on a new page after the references (if your teacher requires footnotes)
• Tables begin each on a new page after the footnotes (if your teacher requires tables) 
• Figures begin on a new page after the tables (if your teacher requires figures)
• Appendices begin on a new page after the tables and/or figures (if your teacher requires appendices)

Sample Papers With Built-In Instructions

To see what your paper should look like, check out these sample papers with built-in instructions.

APA Style uses five (5) levels of headings to help you organize your paper and allow your audience to identify its key points easily. Levels of headings establish the hierarchy of your sections just like you did in your paper outline.

APA tells us to use "only the number of headings necessary to differentiate distinct section in your paper." Therefore, the number of heading levels you create depends on the length and complexity of your paper.

See the chart below for instructions on formatting your headings:

Use Word to Format Your Paper:

Use Google Docs to Format Your Paper:

Placement:  The reference list  appears at the end of the paper, on its own page(s). If your research paper ends on page 8, your References begin on page 9.

Heading:  Place the section label References  in bold at the top of the page, centered.

Arrangement:  Alphabetize entries by author's last name. If source has no named author, alphabetize by the title, ignoring A, An, or The. (9.44-9.48)

Spacing:  Like the rest of the APA paper, the reference list is double-spaced throughout. Be sure NOT to add extra spaces between citations.

Indentation:  To make citations easier to scan, add a  hanging indent  of 0.5 in. to any citation that runs more than one line. Use the paragraph-formatting function of your word processing program to create your hanging indent.  

See Sample References Page (from APA Sample Student Paper):

Elements of Reference List Entries: (Chapter 9)

References generally have four elements, each of which has a corresponding question for you to answer:

• Author:   Who is responsible for this work? (9.7-9.12)
• Date:   When was this work published? (9.13-9.17)
• Title:   What is this work called? (9.18-9.22)
• Source:   Where can I retrieve this work? (9.23-9.37)

By using these four elements and answering these four questions, you should be able to create a citation for any type of source.

For complete information on all of these elements, checkout the APA Style website.

This infographic shows the first page of a journal article. The locations of the reference elements are highlighted with different colors and callouts, and the same colors are used in the reference list entry to show how the entry corresponds to the source.

To create your references, you'll simple look for these elements in your source and put them together in your reference list entry.

American Psychological Association.  Example of where to find reference information for a journal article  [Infographic]. APA Style Center. https://apastyle.apa.org/style-grammar-guidelines/references/basic-principles

Below you'll find two printable handouts showing APA citation examples. The first is an abbreviated list created by MJC Librarians. The second, which is more comprehensive, is from the APA Style website. Feel free to print these for your convenience or use the links to reference examples below:

• APA Citation Examples Created by MJC Librarians for you.
• Common References Examples (APA Handout) Printable handout from the American Psychological Association.
• Journal Article
• Magazine Article
• Newspaper Article
• Edited Book Chapter
• Webpage on a Website

Classroom or Intranet Sources

• Classroom Course Pack Materials
• How to Cite ChatGPT
• Dictionary Entry
• Government Report
• Legal References (Laws & Cases)
• TED Talk References
• Religious Works
• Open Educational Resources (OER)
• Archival Documents and Collections

You can view the entire Reference Examples website below and view a helpful guide to finding useful APA style topics easily:

• APA Style: Reference Examples
• Navigating the not-so-hidden treasures of the APA Style website
• Missing Reference Information

Sometimes you won't be able to find all the elements required for your reference. In that case, see the  instructions in Table 9.1 of the APA style manual in section 9.4 or the APA Style website below:

• Direct Quotation of Material Without Page Numbers

The DOI or URL is the final component of a reference list entry. Because so much scholarship is available and/or retrieved online, most reference list entries end with either a DOI or a URL.

• A  DOI  is a unique alphanumeric string that identifies content and provides a persistent link to its location on the internet. DOIs can be found in database records and the reference lists of published works.
• A  URL  specifies the location of digital information on the internet and can be found in the address bar of your internet browser. URLs in references should link directly to the cited work when possible.

When to Include DOIs and URLs:

• Include a DOI for all works that have a DOI, regardless of whether you used the online version or the print version.
• If an online work has both a DOI and a URL, include only the DOI.
• For works without DOIs from websites (not including academic research databases), provide a URL in the reference (as long as the URL will work for readers).
• For works without DOIs from most academic research databases, do not include a URL or database information in the reference because these works are widely available. The reference should be the same as the reference for a print version of the work.
• For works from databases that publish original, proprietary material available only in that database (such as the UpToDate database) or for works of limited circulation in databases (such as monographs in the ERIC database), include the name of the database or archive and the URL of the work. If the URL requires a login or is session-specific (meaning it will not resolve for readers), provide the URL of the database or archive home page or login page instead of the URL for the work. (See APA Section 9.30 for more information). 
• If the URL is no longer working or no longer provides readers access to the content you intend to cite, try to find an archived version using the Internet Archive , then use the archived URL. If there is no archived URL, do not use that resource.

Format of DOIs and URLs:

Your DOI should look like this: 

https://doi.org/10.1037/a0040251

Follow these guidelines from the APA Style website.

APA Style uses the  author–date citation system , in which a brief in-text citation points your reader to the full reference list entry at the end of your paper. The in-text citation appears within the body of the paper and briefly identifies the cited work by its author and date of publication. This method enables your reader to locate the corresponding entry in the alphabetical reference list at the end of your paper.

Each work you cite  must  appear in the reference list, and each work in the reference list must be cited in the text (or in a table, figure, footnote, or appendix) except for the following (See APA, 8.4):

• Personal communications (8.9)
• General mentions of entire websites, whole periodicals (8.22), and common software and apps (10.10) in the text do not require a citation or reference list entry.
• The source of an epigraph does not usually appear in the reference list (8.35)
• Quotations from your research participants do not need citations or reference list entries (8.36)
• References included in a statistical meta-analysis, which are marked with an asterisk in the reference list, may be cited in the text (or not) at the author’s discretion. This exception is relevant only to authors who are conducting a meta-analysis (9.52).

Formatting Your In-Text Citations

Parenthetical and Narrative Citations: ( See APA Section  8.11)

In APA style you use the author-date citation system for citing references within your paper. You incorporate these references using either a  parenthetical   or a  narrative  style.

Parenthetical Citations

• In parenthetical citations, the author name and publication date appear in parentheses, separated by a comma. (Jones, 2018)
• A parenthetical citation can appear within or at the end of a sentence.
• When the parenthetical citation is at the end of the sentence, put the period or other end punctuation after the closing parenthesis.
• If there is no author, use the first few words of the reference list entry, usually the "Title" of the source: ("Autism," 2008) See APA 8.14
• When quoting, always provide the author, year, and specific page citation or paragraph number for nonpaginated materials in the text (Santa Barbara, 2010, p. 243).  See APA 8.13
• For most citations, the parenthetical reference is placed BEFORE the punctuation: Magnesium can be effective in treating PMS (Haggerty, 2012).

Narrative Citations 

In narrative citations, the author name or title of your source appears within your text and the publication date appears in parentheses immediately after the author name. 

• Santa Barbara (2010) noted a decline in the approval of disciplinary spanking of 26 percentage points from 1968 to 1994.

In-Text Citation Checklist

• In-Text Citation Checklist Use this useful checklist from the American Psychological Association to ensure that you've created your in-text citations correctly.

In-Text Citations for Specific Types of Sources

Quotations from Research Participants

Personal Communications

Secondary Sources  

Use NoodleTools to Cite Your Sources  

NoodleTools can help you create your references and your in-text citations.

• NoodleTools Express No sign in required . When you need one or two quick citations in MLA, APA, or Chicago style, simply generate them in NoodleTools Express then copy and paste what you need into your document. Note: Citations are not saved and cannot be exported to a word processor using NoodleTools Express.
• NoodleTools (Login Full Database) This link opens in a new window Create and organize your research notes, share and collaborate on research projects, compose and error check citations, and complete your list of works cited in MLA, APA, or Chicago style using the full version of NoodleTools. You'll need to Create a Personal ID and password the first time you use NoodleTools.

See How to Use NoodleTools Express to Create a Citation in APA Format

Additional NoodleTools Help

• NoodleTools Help Desk Look up questions and answers on the NoodleTools Web site
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APA 7th Edition Citation Guide

Order of elements: apa student essays, title page and header, table of contents, body and section headings, references page, video tutorial: formatting essays.

• Paraphrase and Summary
• Bibliographic Citations
• Sources with Multiple Authors
• Sources with No Author, Date, Title or Page Numbers
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• Magazine and Newspaper Articles
• Reference Articles, Encyclopedia and Dictionary Entries
• Books and eBooks
• Conference Proceedings and Presentations
• Dissertations and Theses
• Films, Video and Audio
• Government Documents, Non-Profit and Corporate Reports
• Images and Advertisements
• Personal Communications (E-mails, Interviews, and etc.)
• Religious Texts
• Social Media
• Statutes, Legal Documents and the Constitution
• Avoiding Plagiarism

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APA formatted student essays typically contain the following elements in the order listed:

Note : Individual instructors may not require that you include all of these elements.  If you are unsure of which elements to include in your essay, read your assignment's guidelines or ask your instructor. 

VIDEO CONTENTS 

0:00 Introduction 

1:20 General Formatting and Paper Set-Up 

3:23 Title Page 

7:11 Writing the Main Text 

9:08 Section Headings 

12:42 End Matter: References, Footnotes, Tables, Figures, Appendices 

15:56 Closing Thoughts

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• Social Media
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• What is a DOI?
• When Creating Digital Assignments
• When Information is Missing
• Works Cited in Another Source
• In-Text Citation Components
• Paraphrasing
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• Citation Basics
• Reference List and Sample Papers
• Annotated Bibliography
• Academic Writer
• Plagiarism & Citations

Sample Paper & Reference List

• APA Sample Paper Template This sample paper includes a title page, sample assignment page and references list in APA format. It can be used as a template to set up your assignment.
• APA 7th Edition Student Sample Paper This example from Idaho State University presents guidelines for student papers following the American Psychological Association (APA) Publication Manual 7th edition.
• Student APA 7th Edition Sample Paper Example of student APA 7th edition paper with notations from Antioch University Writing Center.
• APA Headings If your instructor requires you to use APA style headings and sub-headings, this document will show you how they work. This sample demonstrates and describes how to use different levels of headings in APA format.
• APA Sample Paper Template - with Appendix If you are adding an appendix to your paper there are a few rules to follow that comply with APA guidelines: The Appendix appears after the References list If you have more than one appendix you would name the first appendix Appendix A, the second Appendix B, etc. The appendices should appear in the order that the information is mentioned in your essay Each appendix begins on a new page

APA End of Paper Checklist

• End of Paper Checklist Finished your assignment? Use this checklist to be sure you haven't missed any information needed for APA style.

Quick Rules for an APA Reference List

Your research paper ends with a list of all the sources cited in the text of the paper. Here are nine quick rules for this Reference list.

• Start a new page for your Reference list. Centre the title, References, at the top of the page.
• Double-space the list.
• Start the first line of each reference at the left margin; indent each subsequent line five spaces (a hanging indent).
• Put your list in alphabetical order. Alphabetize the list by the first word in the reference. In most cases, the first word will be the author’s last name. Where the author is unknown, alphabetize by the first word in the title, ignoring the words a, an, the.
• For each author, give the last name followed by a comma and the first (and middle, if listed) initials followed by periods.
• Italicize the titles of these works: books, audiovisual material, internet documents and newspapers, and the title and volume number of journals and magazines.
• Do not italicize titles of most parts of works, such as: articles from newspapers, magazines, or journals / essays, poems, short stories or chapter titles from a book / chapters or sections of an Internet document.
• In titles of non-periodicals (books, videotapes, websites, reports, poems, essays, chapters, etc), capitalize only the first letter of the first word of a title and subtitle, and all proper nouns (names of people, places, organizations, nationalities).
• If a web source (not from the library) is not a stable archived version, or you are unsure whether it is stable, include a statement of the accessed date before the link.
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Getting started

This APA 7th style guide is based on the citing and referencing sections of the  Publication Manual of the American Psychological Association  (7th edition ) and the APA Style website . This guide is designed to help you:

Our interactive online tutorials can help you understand the basics of citing and referencing, and why it's important.

Elements of citing and referencing in APA 7th style

There are two places in your assignments and other academic work you need to cite and reference- in the body of your writing ( in-text citations ) , and   at the end of your work (in the  reference list ) where you provide full details of the works you have cited. 

The Quick Start Guide (below) will help you quickly become familiar with the key features of APA 7th, and their application.

Additional resources

Quick start guide [pdf 0.2mb].

A printable two-page introduction with key examples.

Find unusual source types

Visit the APA Style Blog for unusual source types not in this guide.

APA 7th in-text citation checklist

Helps you cover the important aspects of citing and referencing.

For when you need support beyond this guide

• Next: In-text citation >>
• Last Updated: May 1, 2024 2:10 PM
• URL: https://guides.lib.monash.edu/apa-7

• Free Tools for Students
• APA Citation Generator

Free APA Citation Generator

Generate citations in APA format quickly and automatically, with MyBib!

🤔 What is an APA Citation Generator?

An APA citation generator is a software tool that will automatically format academic citations in the American Psychological Association (APA) style.

It will usually request vital details about a source -- like the authors, title, and publish date -- and will output these details with the correct punctuation and layout required by the official APA style guide.

Formatted citations created by a generator can be copied into the bibliography of an academic paper as a way to give credit to the sources referenced in the main body of the paper.

👩‍🎓 Who uses an APA Citation Generator?

College-level and post-graduate students are most likely to use an APA citation generator, because APA style is the most favored style at these learning levels. Before college, in middle and high school, MLA style is more likely to be used. In other parts of the world styles such as Harvard (UK and Australia) and DIN 1505 (Europe) are used more often.

🙌 Why should I use a Citation Generator?

Like almost every other citation style, APA style can be cryptic and hard to understand when formatting citations. Citations can take an unreasonable amount of time to format manually, and it is easy to accidentally include errors. By using a citation generator to do this work you will:

• Save a considerable amount of time
• Ensure that your citations are consistent and formatted correctly
• Be rewarded with a higher grade

In academia, bibliographies are graded on their accuracy against the official APA rulebook, so it is important for students to ensure their citations are formatted correctly. Special attention should also be given to ensure the entire document (including main body) is structured according to the APA guidelines. Our complete APA format guide has everything you need know to make sure you get it right (including examples and diagrams).

⚙️ How do I use MyBib's APA Citation Generator?

Our APA generator was built with a focus on simplicity and speed. To generate a formatted reference list or bibliography just follow these steps:

• Start by searching for the source you want to cite in the search box at the top of the page.
• MyBib will automatically locate all the required information. If any is missing you can add it yourself.
• Your citation will be generated correctly with the information provided and added to your bibliography.
• Repeat for each citation, then download the formatted list and append it to the end of your paper.

MyBib supports the following for APA style:

Daniel is a qualified librarian, former teacher, and citation expert. He has been contributing to MyBib since 2018.

Writing Resources

Beyond one-to-one consultations , the Howe Writing Center (HWC) offers a number of resources to help Miami students grow as writers.

Use the Howe Writing Center Handouts as reference sheets when you take writing classes. There are 30 Handouts in total covering such topics as the writing process, working with sources, and grammar & punctuation. For writing related to specific majors, see the Disciplinary Writing Guides prepared by the Howe Center for Writing Excellence (HCWE).

We also want to help you refine your writing practice and encourage you toward your best work. Our compilation of digital tools for writing can give you new ways of approaching the writing process. Creative writers are especially welcome to pass their writing by us ( quite a few of our consultants are creative writers! ) and browse our list of publication venues .

Types of Writing

• Annotated Bibliographies
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• PowerPoint Presentations
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Writing Process

• Writing Process Overview
• Generating Ideas
• Developing Ideas
• Supporting an Argument
• Introductions
• Thesis Statements
• Conclusions
• Reverse Outlining
• Revision Strategies
• Editing for Clear Style

Using Sources

• Plagiarism Prevention (Quoting, Summarizing, and Paraphrasing) 
• Reliable Sources
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Physical Review Letters

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Laser Excitation of the Th-229 Nucleus

J. tiedau, m. v. okhapkin, k. zhang, j. thielking, g. zitzer, e. peik, f. schaden, t. pronebner, i. morawetz, l. toscani de col, f. schneider, a. leitner, m. pressler, g. a. kazakov, k. beeks, t. sikorsky, and t. schumm, phys. rev. lett. 132 , 182501 – published 29 april 2024, see viewpoint: shedding light on the thorium-229 nuclear clock isomer.

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• ACKNOWLEDGMENTS

The 8.4 eV nuclear isomer state in Th-229 is resonantly excited in Th-doped CaF 2 crystals using a tabletop tunable laser system. A resonance fluorescence signal is observed in two crystals with different Th-229 dopant concentrations, while it is absent in a control experiment using Th-232. The nuclear resonance for the Th 4 + ions in Th: CaF 2 is measured at the wavelength 148.3821(5) nm, frequency 2020.409(7) THz, and the fluorescence lifetime in the crystal is 630(15) s, corresponding to an isomer half-life of 1740(50) s for a nucleus isolated in vacuum. These results pave the way toward Th-229 nuclear laser spectroscopy and realizing optical nuclear clocks.

• Received 5 February 2024
• Revised 12 March 2024
• Accepted 14 March 2024

DOI: https://doi.org/10.1103/PhysRevLett.132.182501

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

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Shedding Light on the Thorium-229 Nuclear Clock Isomer

Published 29 april 2024.

Researchers use a laser to excite and precisely measure a long-sought exotic nuclear state, paving the way for precise timekeeping and ultrasensitive quantum sensing.

See more in Physics

Authors & Affiliations

• Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
• Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
• * These authors contributed equally to this letter.
• † [email protected]
• ‡ [email protected]

Article Text

Vol. 132, Iss. 18 — 3 May 2024

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Excitation scheme (a) and experimental apparatus (b) for VUV laser spectroscopy of the isomeric state in Th-doped crystals. The VUV source consists of two cw lasers with the frequencies ν 1 , ν 2 , two pulsed dye amplifiers that introduce frequency shifts ( δ B 1 , δ B 2 ) due to Brillouin mirrors, a THG stage, and a xenon gas cell. The scanning is provided by tuning of the difference frequency Ω 2 via ν 2 . The spectroscopy vacuum chamber contains the Th-doped crystal mounted on a cold finger, signal collection optics, and a PMT. (c) False color CCD camera image of the crystal during VUV laser excitation and a schematic representation of the crystal structure of Th 4 + ions doped into the CaF 2 lattice with 2 F − for interstitial charge compensation.

(a) VUV fluorescence signals from the Th-229-doped X2 crystal, recorded in frequency scans from higher to lower frequency (squares) and lower to higher frequency (dots). The measurement time between frequency steps is shorter than the isomer decay time (see Fig.  3 ), which leads to an asymmetry in the resonance curves. (b) The resonance asymmetry is removed, together with the radioluminescence background, from the plots (a) in postprocessing. (c) Result of a control experiment with the Th-232-doped V12 crystal.

Th-229 fluorescence decay curve after resonant excitation (blue trace) for 500 s measured with crystal X2 at a temperature of 150 K. Gray trace: result of a control experiment with 200 GHz off-resonant excitation, showing no long-lived photoluminescence. Inset: fluorescence decay times for crystal temperatures between 108 and 168 K. No changes in the decay time are observed within the measurement uncertainty. An overall decay time constant τ = 630 ( 15 )     s is observed.

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