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标题: "Benchmark measurements of absolute frequencies and collisional line-shape parameters in the CO-Ar system using comb-based FTS"
原文链接: "https://arxiv.org/abs/2608.10508"
发布日期: "2026-08-11"
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---

## Physics > Chemical Physics

**arXiv:2608.10508** (physics)

## Title:Benchmark measurements of absolute frequencies and collisional line-shape parameters in the CO-Ar system using comb-based FTS

[View PDF](https://arxiv.org/pdf/2608.10508)

> Abstract:We report absolute frequency measurements of the CO fundamental band, together with high-precision Ar-induced collisional line-shape parameters using comb-based Fourier-transform spectroscopy. High-quality spectra were obtained with a stable mid-IR optical frequency comb source and careful suppression of technical noise. By applying analysis methods that fully exploit the advantages of optical frequency comb spectroscopy, precise frequency calibration and robust multi-line fitting were achieved, resulting line-center fitting errors below 0.00001 cm $^{-1}$ for most transitions. The measured transition frequencies agree with HITRAN within 0.0001 cm $^{-1}$, supporting the reliability of the semi-empirical database. Multi-line fits using a speed-dependent Voigt profile yield collisional parameters for approximately 40 P- and R-branch lines, providing a reliable experimental benchmark for CO-Ar line-shape modeling.

| Comments: | 14 pages, 8 figures in main manuscript. 5 pages of supplemental document with 2 figures and 2 tables |
| --- | --- |
| Subjects: | Chemical Physics (physics.chem-ph) |
| Cite as: | [arXiv:2608.10508](https://arxiv.org/abs/2608.10508) \[physics.chem-ph\] |
|  | (or [arXiv:2608.10508v1](https://arxiv.org/abs/2608.10508v1) \[physics.chem-ph\] for this version) |
|  | [https://doi.org/10.48550/arXiv.2608.10508](https://doi.org/10.48550/arXiv.2608.10508) Focus to learn more  arXiv-issued DOI via DataCite (pending registration) |

## Submission history

From: Akiko Nishiyama \[[view email](https://arxiv.org/show-email/bcaf1796/2608.10508)\]  
**\[v1\]** Tue, 11 Aug 2026 05:31:10 UTC (2,207 KB)

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