Journal of Chemical Physics Formatting Requirements: Complete Author Guide

Method note: This formatting guide was reviewed against AIP Publishing author instructions, the JCP author pages, REVTeX guidance, and Manusights pre-submission review patterns for physical chemistry and computational chemistry manuscripts. Sources checked include AIP instructions for manuscript order, graphics, author declarations, and supplementary material. Use this page when formatting is the active blocker; use the JCP journal profile, impact-factor page, or submission-process page for fit and timeline decisions.

JCP takes an unusual approach to length: there's no stated word limit for most article types. The expectation is that you'll write as concisely as the science allows.

The absence of a word limit doesn't mean your paper can be any length. JCP editors are known for pushing back on papers they consider unnecessarily long. If a referee suggests cutting 30% of a paper, the editor will almost always support that recommendation. The culture at JCP favors density over completeness.

Communications at JCP are genuinely short papers, not just regular papers with a different label. They're meant for results that are important enough to merit fast publication but focused enough to present in 3 to 4 pages. The review process for Communications is typically faster than for Articles.

The Tutorial format is worth noting. JCP introduced this category to provide pedagogical resources for the chemical physics community. Tutorials can be substantially longer than Articles and include more background and worked examples. If your paper is running long because you're explaining a lot of methodology, the Tutorial format might be a better fit.

JCP keeps its abstract requirements straightforward.

• Word limit: No formal limit, but 150 to 250 words is the expected range
• Structure: Unstructured single paragraph
• Citations: Not permitted
• Footnotes: Not permitted
• Abbreviations: Define only standard abbreviations at first use
• Keywords: JCP does not require author-submitted keywords. The editorial system assigns subject categories.

The lack of a formal word limit on the abstract doesn't mean you should write 400 words. JCP abstracts are traditionally compact. Look at any issue of the journal and you'll see that most abstracts cluster around 150 to 200 words. Writing a long abstract signals unfamiliarity with the journal's norms.

JCP doesn't use keywords in the traditional sense. Instead, the journal uses an internal taxonomy of subject areas (atomic, molecular, chemical physics, etc.) that the editor assigns during initial processing. You don't need to include a keywords section in your manuscript.

JCP follows AIP's figure guidelines, which are detailed and specific.

Figure specifications:

Vector graphics (EPS, PDF) are strongly preferred for plots, diagrams, and schematics. Raster formats (TIFF, PNG) should be reserved for photographs, micrographs, and images that can't be rendered as vectors. This matters more at JCP than at many journals because theoretical and computational papers often contain plots that look terrible when saved as low-resolution raster images.

Table formatting:

• Double-line rule at top and bottom
• Single-line rule below column headers
• No vertical rules
• Table footnotes use superscript lowercase letters
• Tables are numbered sequentially with Roman numerals (Table I, Table II, etc.) in AIP style

The Roman numeral table numbering is a JCP convention that differs from most other journals. Don't use Arabic numerals (Table 1, Table 2) because the production team will change them, and the renumbering can introduce errors in cross-references.

JCP uses the standard AIP reference style.

In-text citations: Superscript numbers (e.g., "as shown previously^1,2"). No brackets or parentheses.

Reference list format:

1. A. B. Author, C. D. Author, and E. F. Author, "Title of article," J. Chem. Phys. 150, 123456 (2019).

Key formatting details:

• Author names: Initials first, then surname (e.g., "J. K. Smith")
• Use "and" before the last author
• Article titles are included and placed in quotation marks
• Journal names are abbreviated using ISO 4
• Volume numbers are in bold
• Page numbers follow the volume, separated by a comma
• Year in parentheses at the end
• DOIs are encouraged but not displayed in the reference list (they're linked in the online version)

For books:

2. A. B. Author, Title of Book (Publisher, City, Year).

For chapters in edited books:

3. A. B. Author, "Chapter Title," in Title of Book, edited by C. D. Editor (Publisher, City, Year), pp. 100-150.

If you use BibTeX (and you should, since JCP is a LaTeX-first journal), the aipnum4-2.bst style file handles all of this automatically. It ships with the REVTeX 4.2 distribution.

JCP calls supplementary content "supplementary material" (not "supporting information" as ACS does, or "supplementary information" as Nature uses).

What goes in supplementary material:

• Detailed derivations that would interrupt the flow of the main text
• Additional computational results (convergence tests, basis set comparisons)
• Extended data tables
• Multimedia content (videos of simulations, animations)
• Code snippets or pseudocode

Formatting requirements:

• Submit as a PDF file, formatted to be self-contained (with its own title and brief introduction)
• Label figures as Fig. S1, Fig. S2, etc.
• Label tables as Table SI, Table SII, etc. (Roman numerals, matching the main text convention)
• Each item must be cited in the main text
• Maximum file size: check the submission system, but typically 50 MB

For computational chemistry papers, JCP expects Cartesian coordinates of optimized structures to be provided either in the supplementary material or in a data repository. This has been an informal expectation for years and is now essentially mandatory. Referees will ask for coordinates if they're missing.

Large datasets (molecular dynamics trajectories, DFT output files, etc.) should be deposited in repositories like Zenodo, figshare, or discipline-specific databases rather than submitted as supplementary files.

Details specific to JCP that experienced authors know:

The title page includes a date line. JCP manuscripts include "Dated:" on the title page, which REVTeX fills in automatically with the compilation date. Some authors manually override this, but it's better to let it auto-generate. The actual submission and acceptance dates are added by the editorial office.

Equations are numbered by section in long papers. For papers with many equations, JCP allows section-based equation numbering (e.g., Eq. 2.3 for the third equation in Section II). Use \numberwithin{equation}{section} in LaTeX. This isn't required but is common practice in theoretical papers.

Section headings use Roman numerals. JCP sections are numbered I, II, III, etc. (Roman numerals, uppercase). Subsections use A, B, C. Sub-subsections use 1, 2, 3. The REVTeX template handles this, but if you're formatting manually, the pattern is I. INTRODUCTION, II. METHODS, etc., with the heading in uppercase.

The journal uses "AUTHOR DECLARATIONS" section. JCP requires a Conflict of Interest disclosure and an Author Contributions section (using CRediT taxonomy) at the end of the manuscript, before the references. The REVTeX template has dedicated commands for these.

JCP has a preprint-friendly policy. The journal allows posting to arXiv and other preprint servers before, during, and after review. This is relevant to formatting because arXiv has its own compilation requirements. The REVTeX template compiles cleanly on arXiv without modification in most cases.

Footnotes appear as endnotes. In JCP's published format, footnotes are merged into the reference list as numbered endnotes. In the manuscript, use \footnote{} normally and the template handles the merging. Don't manually number footnotes or try to place them in the reference list yourself.

Common issues that delay JCP manuscripts:

1. Using the wrong REVTeX options. The document class must include both aip and jcp options. Using aps (the default) instead of aip produces the wrong formatting for AIP journals.

1. Arabic numeral table numbering. JCP uses Roman numerals for tables (Table I, not Table 1). This is unique among major chemistry journals and is easy to miss.

1. Missing author declarations. The Conflict of Interest and Author Contributions sections are mandatory and must use the template's dedicated sections.

1. Figures submitted only as raster images. For plots and diagrams, vector formats (EPS, PDF) are strongly preferred. Raster plots look poor at print resolution and may be flagged during production.

1. Bibliography compiled with the wrong .bst file. Using a non-AIP bibliography style file produces incorrectly formatted references. Use aipnum4-2.bst specifically.

In our pre-submission review work with manuscripts targeting Journal of Chemical Physics, four specific failure patterns generate the most consistent desk-rejection outcomes. We do not have private JCP editorial files; this analysis combines official-source facts, public AIP guidance, and recurring Manusights submission-analysis patterns.

Article type does not match content: Article vs. Communication vs. Perspective. JCP publishes Articles (standard full research papers), Communications (short urgent reports, 4 pages maximum), Letters (brief high-priority results), and Perspectives (review-like articles). The most common mismatch is submitting a Communications-length paper as a full Article, or submitting a comprehensive study as a Communication. The page and word limits for each type must be adhered to within AIP formatting before submission.

Mathematical derivations contain gaps or unstated assumptions. JCP reviewers include physical chemists and theoretical physicists who check derivations in detail. Papers that present equations with steps omitted ("it can be shown that...") or with approximations not explicitly stated and justified are sent back for mathematical completeness. Supplementary sections for derivations are expected when the derivation would interrupt the flow of the main text.

Benchmark comparisons against established methods absent. JCP studies introducing new computational methods, potentials, or algorithms are expected to include benchmarks against recognized reference data (CCSD(T)/complete basis set for electronic structure, experimental data for molecular dynamics). Papers reporting a new method without comparison to established performance benchmarks are returned with requests to add validation.

Figure widths do not match AIP column specifications. AIP journals require figures at 8.8 cm (single-column) or 18.0 cm (double-column). Figures submitted at Elsevier, ACS, or arbitrary widths do not fit the AIP template layout and must be resized. Font sizes in figures must remain readable at the final printed column width.

A Journal of Chemical Physics submission readiness check evaluates manuscript scope, AIP formatting compliance, and mathematical rigor against these desk-rejection patterns.