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Torsion–Rotation Energy Levels and the Hindering Potential Barrier for the Excited Vibrational State of the OH-Stretch Fundamental Band ν1of Methanol
Journal of Molecular Spectroscopy ( IF 1.4 ) Pub Date : 1998-12-01 , DOI: 10.1006/jmsp.1998.7689
Hunt 1 , Shelton , Flaherty , Cook
Affiliation  

The absorption spectrum of methanol vapor has been recorded at room temperature from 3200 to 4200 cm-1 with a 1.24-M path-difference Fourier transform spectrometer. Over 10 000 transitions to the torsion-rotation states n, tau J, K of the OH stretching fundamental band nu1 have been assigned, thereby greatly expanding the results of previous investigations. Approximately 4000 of the cleaner lines have been used to determine 665 excited state torsion-rotation levels with principal torsional quantum number n = 0 as well as 494 levels with n = 1, 286 levels with n = 2, and 14 levels with n = 3. These levels correspond to 86 values of the quantum numbers n, tau, K. Most of the levels of a given n, tau, K are perturbed resulting in irregular P-, Q-, and R-branch series. The J = 0 origins for 64 values of n, tau, K have been fitted and a value of 410 cm-1 obtained for the hindering potential barrier. This is in agreement with a previous study of grating spectra but is lower than that obtained in more recent analyses of n = 0 <-- 0 transitions observed for K

中文翻译:

甲醇的 OH-拉伸基带 ν1 的激发振动状态的扭转-旋转能级和阻碍势垒

甲醇蒸气的吸收光谱在室温下从 3200 到 4200 cm-1 用 1.24-M 光程差傅立叶变换光谱仪记录。已经指定了超过 10 000 次过渡到 OH 拉伸基带 nu1 的扭转-旋转状态 n、tau J、K,从而大大扩展了先前研究的结果。大约 4000 条更清晰的线已被用于确定 665 个激发态扭转旋转能级,主扭转量子数 n = 0,以及 494 个能级,n = 1,286 个能级,n = 2,14 个能级,n = 3 . 这些能级对应于量子数 n、tau、K 的 86 个值。给定 n、tau、K 的大多数能级都受到扰动,导致不规则的 P-、Q-和 R-分支系列。64 个 n、tau、已经拟合了 K 并且获得了 410 cm-1 的阻势势垒值。这与之前对光栅光谱的研究一致,但低于最近对 n = 0 <- 0 观察到的 K 跃迁的分析中获得的结果
更新日期:1998-12-01
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