Abstract Diode laser spectra of CH 2 F 37 Cl (95% isotopically pure sample) have been recorded in the 9.4 μm region characterized by the ν 4 fundamental. The spectral analysis allowed the assignment of more than 3700 transitions with J ≤ 92 and K a ≤ 16 of the expected a / b -hybrid structure. The ν 4 fundamental, whose origin is at 1067.7140 cm −1 , mainly interacts through a - and b -type Coriolis
摘要 CH 2 F 37 Cl(95% 同位素纯样品)的二极管激光光谱已记录在以 ν 4 基波为特征的 9.4 μm 区域。光谱分析允许分配超过 3700 个跃迁,其中 J ≤ 92 和 K a ≤ 16 的预期 a / b 杂化结构。原点在 1067.7140 cm -1 的 ν 4 基波主要通过 a - 和 b 型科里奥利耦合与位于 1002 cm -1 附近较低波数的 ν 9 基波相互作用。对于 K a ′ = 14 能级,已经观察到由费米共振与 ν 5 + ν 6 产生的局部效应。通过将较少扰动的跃迁拟合到 I r 表示中的 Watson 的 A 归约哈密顿量来确定一组有效的上能态分子常数。由于二阶 a 型科里奥利共振,在避免的交叉点附近观察到并分配了许多允许扰动的 ν 9 跃迁。使用合适的程序,我们经历了两带系统分析,该分析产生了 v 4 = 1 和 v 9 = 1 状态的分子常数以及相互作用参数。从
Goel, R. G.; Prasad, H. S., Canadian Journal of Chemistry, 1970, vol. 48, p. 2488 - 2493
作者:Goel, R. G.、Prasad, H. S.
DOI:——
日期:——
The vibrational spectra and normal coordinates analysis of bromofluoromethane, CH 2 BrF
作者:A Baldacci、A Baldan、A Gambi、P Stoppa
DOI:10.1016/s0022-2860(99)00251-3
日期:2000.2
The infrared gas-phase spectra of bromofluoromethane (CH2BrF) have been studied in the region below 6200 cm(-1) under conditions of medium resolution. All the fundamentals and many overtones, combination and hot bands have been assigned leading to an almost complete set of anharmonicity constants. Rotational analyses have been performed on the observed Q-branch features of over 10 bands. Enriched Br-79 and Br-81 samples were also employed to confirm vibrational assignment and supply further data. Analyses of Fermi resonance are made. The molecular structure was calculated ab initio at the Hartree-Fock (HF), the second-order Moller-Plesset (MP2) and the density functional theory (DFT) level with the 6-311++G(3df, 2pd) basis set. The ab initio force constants obtained from the vibrational analysis at B3LYP/6-311++G(3df, 2pd) level of theory were employed to fit the experimental data and an optimal harmonic force field was obtained for the CH2BrF molecule. (C) 2000 Elsevier Science B.V. All rights reserved.