Line shape parameters of self-broadened CO transitions in the (3-0) overtone band

IF 2.3 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-05-06 DOI:10.1016/j.jqsrt.2025.109483

Q. Huang , J. Wang , J.-K. Li , Z.-L. Nie , A.-W. Liu , Y. Tan , S.-M. Hu

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引用次数: 0

Abstract

This study employs laser-locked cavity ring-down spectroscopy to investigate 15 weak ¹²C¹⁶O transitions in the near-infrared, corresponding to the P and R branches of the (3-0) band with rotational quantum numbers

J

ranging from 25 to 35. Most spectra were recorded at low pressures (below 1333 Pa), where Doppler broadening dominates, and collision broadening is mainly driven by speed-dependent interactions. This environment enables precise determination of collisional line shape parameters. The Padé approximation and polynomial fit were used to estimate speed-dependent Voigt (SDV) broadening parameters, extending the data to higher rotational quantum numbers. Accurate self-broadening parameters for CO were obtained, which are essential for studying pressure broadening by other atmospheric gases. These results will support high-precision radiative transfer models for Earth’s atmosphere in this spectral region.

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（3-0）泛音带自展宽CO跃迁的线形参数

本研究采用激光锁腔衰荡光谱研究了近红外中15个弱12C16O跃迁，对应于（3-0）波段的P和R分支，旋转量子数J在25 ~ 35之间。大多数光谱记录在低压（1333 Pa以下），其中多普勒展宽占主导地位，碰撞展宽主要由速度依赖的相互作用驱动。这种环境可以精确地确定碰撞线的形状参数。利用pad近似和多项式拟合来估计速度相关的Voigt （SDV）展宽参数，将数据扩展到更高的旋转量子数。得到了CO的精确自展宽参数，这对研究其他大气气体的压力展宽具有重要意义。这些结果将支持该光谱区域地球大气的高精度辐射传输模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Quantitative Spectroscopy & Radiative Transfer 物理-光谱学

CiteScore

5.30

自引率

21.70%

发文量

273

审稿时长

58 days

期刊介绍： Papers with the following subject areas are suitable for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer: - Theoretical and experimental aspects of the spectra of atoms, molecules, ions, and plasmas. - Spectral lineshape studies including models and computational algorithms. - Atmospheric spectroscopy. - Theoretical and experimental aspects of light scattering. - Application of light scattering in particle characterization and remote sensing. - Application of light scattering in biological sciences and medicine. - Radiative transfer in absorbing, emitting, and scattering media. - Radiative transfer in stochastic media.