Chang BC, Fei R, Sears TJ
Department of Chemistry, National Central University, Chung-Li, 32054, Taiwan
J Mol Spectrosc. 1997 Jun;183(2):341-6. doi: 10.1006/jmsp.1997.7291.
The observation of the C-Cl stretching fundamental of HC35 Cl in its ground X ; 1 A ' state is reported. HCCl was formed in a continuous flow system by the excimer laser photolysis of CHBr2 Cl at 193 nm and the transient absorption recorded by infrared diode laser spectroscopy. The band has a -type character and the fundamental vibrational frequency is found to be 811.5963 cm-1 . No evidence was found for perturbations in either the ground or vibrationally excited states, implying that the excited triplet a 3 A " states lies above the C-Cl stretching level in HCCl. The observed rotation-vibration transitions were well fit by a standard asymmetric rotor Hamiltonian. There is a decrease in the A rotational constant on vibrational excitation, suggesting that some bend-C-Cl stretch coupling is present.
报道了在基态X̃ 1A′ 态下对HC35Cl的C-Cl伸缩基频的观测。HCCl是在连续流动系统中通过193nm准分子激光对CHBr2Cl进行光解而形成的，并通过红外二极管激光光谱记录瞬态吸收。该谱带具有a型特征，基频振动频率为811.5963cm-1。在基态或振动激发态中均未发现微扰的证据，这意味着激发的三重态a 3A″ 态位于HCCl的C-Cl伸缩能级之上。观测到的转动-振动跃迁可以用标准的不对称转子哈密顿量很好地拟合。振动激发时A转动常数减小，表明存在一些弯曲-C-Cl伸缩耦合。
