egan_2024_correction

P. F. Egan and Y. Yang, “Correction to: Optical n(p, T90) Measurement Suite 1: He, Ar, and N2”, Int. J. Thermophys. 45, 177 (2024)

Source record · Catalogue · Review register

DOI: 10.1007/s10765-024-03473-6

Source kind: measurement

Recorded technique: The authors’ correction to egan_2023 (Fabry-Perot cavity refractometry of Ar and N2 at 632.9908 nm): the treatment of the Gouy phase shift, and so the refractometer working equation, Eq. (1) of the original; no new measurement is described.

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

Two pages (published online 28 November 2024); identity VALIDATED_WITH_WARNINGS in the library (the title’s math is garbled in the metadata; DOI, journal, authors and the DOI of the corrected article printed on p. 1 agree). Read in full (2026-09-29).

WHAT IT CORRECTS (pp. 1-2): the original stated that the cavity beam waist stays constant when the refractive index rises; by Kogelnik and Li’s Eqs. (1)-(2) the waist depends on the wavelength in the medium, so the Gouy phase shift does not depend on the index. The corrected working equation, Eq. (3): n - 1 = (Delta f + kappa Delta p nu_gas) / [nu_gas (1 - kappa Delta p) + eps_tau (nu_gas - nu_c)], without the factor (1 + eps_d) in the denominator, valid for constant L/r under uniform pressure.

THE EFFECT (p. 2): ‘The reported molar refractivities for argon and nitrogen were fractionally small by 0.3 x 10^-6 A_R’, an order of magnitude below their combined standard uncertainty (3.1e-6). Applied as [[errata]] of egan_2023’s A_R_Ar and A_R_N2 (4.195735 -> 4.1957363, 4.446175 -> 4.4461763 cm^3/mol; the correction’s factor applied, not printed values). A_theta (N2’s temperature coefficient) and the helium compressibility calibration are not addressed: a relative scale factor common to all isotherms leaves A_theta unchanged to first order, but the correction does not say so.

NOT CHECKED: whether yang_2025 (same laboratory and cavity, published June 2025) used the corrected working equation, and whether lang_2026’s reproduced Egan-Yang value (egan_yang_303K) is the corrected one (TC-724).

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

No formulas are recorded.

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.