Pine A S, Lafferty W J
National Bureau of Standards, Washington, DC 20234.
J Res Natl Bur Stand (1977). 1982 May-Jun;87(3):237-256. doi: 10.6028/jres.087.017.
The Doppler-limited absorption spectrum of the C-H stretching region of ethane has been recorded at ≃ 119 K with a tunable difference-frequency laser spectrometer. The strong torsional hot band structure at room temperature is eliminated at 119 K, and the enhanced resolution from the Doppler width reduction allows us to observe small torsional splittings. The two fundamentals in the region, , a perpendicular band and, , a parallel band have been essentially completely assigned as have a large number of transitions in the parallel component of the + combination band. A number of perturbations of both global and local nature have been observed. The complete spectrum and a listing of transition wavenumbers, intensities and assignments are presented here to facilitate identification and quantitative analysis of ethane in a variety of monitoring applications. Precise ground state rotational constants have been determined from combination differences.
使用可调谐差频激光光谱仪在约119 K的温度下记录了乙烷C-H伸缩振动区域的多普勒极限吸收光谱。室温下强烈的扭转热带结构在119 K时消失，多普勒宽度减小带来的分辨率提高使我们能够观察到小的扭转分裂。该区域的两个基频，一个垂直带和一个平行带，以及ν₁+ν₃组合带平行分量中的大量跃迁已基本完全归属。观察到了一些全局和局部性质的微扰。这里给出了完整的光谱以及跃迁波数、强度和归属列表，以便于在各种监测应用中对乙烷进行识别和定量分析。通过组合差值确定了精确的基态转动常数。
