Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
J Chem Phys. 2013 Nov 21;139(19):194312. doi: 10.1063/1.4830219.
We present a line-shape analysis of the rovibronic R1 Q2 transition of the oxygen B band resolved by the Pound-Drever-Hall-locked frequency-stabilized cavity ring-down spectroscopy technique in the low pressure range. The frequency axis of the spectra is linked by the ultra-narrow diode laser to the optical frequency comb in order to measure the absolute frequency at each point of the recorded spectra. Experimental spectra are fitted with various line-shape models: the Voigt profile, the Galatry profile, the Nelkin-Ghatak profile, the speed-dependent Voigt profile, and the speed-dependent Nelkin-Ghatak profile with quadratic and hypergeometric approximations for the speed dependence of collisional broadening and shifting. The influences of Dicke narrowing, speed-dependent effects, and correlation between phase- and velocity-changing collisions on the line shape are investigated. Values of line-shape parameters, including the absolute frequency of the transition 435685.24828(46) GHz, are reported.
我们呈现了通过 Pound-Drever-Hall 锁定的频率稳定腔衰荡光谱技术在低压范围内分辨的氧 B 带的 rovibronic R1 Q2 跃迁的线型分析。光谱的频率轴通过超窄线二极管激光器与光学频率梳相联系，以便在记录的光谱的每个点测量绝对频率。实验光谱与各种线型模型拟合：Voigt 轮廓、Galatry 轮廓、Nelkin-Ghatak 轮廓、速度相关的 Voigt 轮廓以及速度相关的 Nelkin-Ghatak 轮廓，对于碰撞展宽和移动的速度依赖性，使用二次和超几何近似。研究了 Dicke 变窄、速度相关效应以及相移和速度变化碰撞之间的相关性对线型的影响。报告了线型参数的值，包括跃迁 435685.24828(46)GHz 的绝对频率。
