Manifestation of binary collisions in the Raman-allowed bending vibrational band of the SF6 molecule

IF 1.4 4区 物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Journal of Molecular Spectroscopy Pub Date : 2023-11-01 DOI:10.1016/j.jms.2023.111857
Florent Rachet, Michael Chrysos
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Abstract

A careful, principally experimental Raman study which puts the focus on the ν5 bending vibrational band by gaseous room-temperature sulfur hexafluoride is reported. In essence, our results boil down in the following two findings. Firstly, the anisotropic Raman-allowed spectrum by that band, which for the first time was isolated from the recordings and calibrated on an absolute scale. Secondly, an absolute-calibrated binary collision-induced component, which was also for the first time extracted from the crude measurements in the wavenumber range 475–570 cm−1. Both spectra are depolarized and lead to parameters in agreement with the existing literature. The reported findings bring us one step closer to understanding how vibration mechanisms work in SF6 and show among other things that, at the ν5 frequency, collisions between molecules enhance light scattering by 0.8% at 1 atm and by 13% at 15 atm of sulfur hexafluoride gas pressure.

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SF6分子拉曼允许弯曲振动带中二元碰撞的表现
本文报道了一项详细的、主要是实验性的拉曼研究,该研究的重点是气体室温六氟化硫的ν5弯曲振动带。从本质上讲,我们的结果可以归结为以下两个发现。首先,该波段的各向异性拉曼允许光谱,首次从记录中分离出来并在绝对尺度上进行校准。其次,从475 ~ 570cm−1波数范围内的原始测量数据中首次提取了绝对校准的二元碰撞诱导分量。两种光谱都是去极化的,得到的参数与现有文献一致。报告的发现使我们更接近于理解SF6中的振动机制是如何工作的,并表明在ν5频率下,分子之间的碰撞使光散射在1atm下增加0.8%,在15atm的六氟化硫气体压力下增加13%。
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来源期刊
CiteScore
2.70
自引率
21.40%
发文量
94
审稿时长
29 days
期刊介绍: The Journal of Molecular Spectroscopy presents experimental and theoretical articles on all subjects relevant to molecular spectroscopy and its modern applications. An international medium for the publication of some of the most significant research in the field, the Journal of Molecular Spectroscopy is an invaluable resource for astrophysicists, chemists, physicists, engineers, and others involved in molecular spectroscopy research and practice.
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