Xu LH, Wang X, Cronin TJ, Perry DS, Fraser GT, Pine AS
Department of Physical Sciences, University of New Brunswick, Saint John, New Brunswick, E2L 4L5, Canada
J Mol Spectrosc. 1997 Sep;185(1):158-72. doi: 10.1006/jmsp.1997.7367.
The infrared spectrum of jet-cooled methanol in the CH-stretch fundamental region has been investigated by two sub-Doppler laser techniques: optothermally detected molecular-beam electric resonance and direct-absorption slit-jet spectroscopy. With the aid of microwave-infrared double resonance and ground state combination differences, 27 subbands in the frequency range 2967 to 3027 cm-1 have been assigned to the nu2 fundamental. Perturbation systems in the K' = 0 E, -1 E, and -2 E symmetry subbands have been analyzed to yield matrix elements of 0.013, 0.041, and 0.75 cm-1, respectively. The A-E torsional tunneling splitting for J = 0 of the nu2 vibration of -3.26 cm-1 is of opposite sign and a factor of three smaller in magnitude than the ground state value of +9.12 cm-1. Copyright 1997 Academic Press. Copyright 1997Academic Press
利用两种亚多普勒激光技术，对喷射冷却甲醇在C-H伸缩基频区域的红外光谱进行了研究：光热检测分子束磁共振和直接吸收狭缝射流光谱法。借助微波-红外双共振和基态组合差，在2967至3027 cm-1频率范围内的27个亚带已被指定为ν2基频。对K' = 0 E、-1 E和-2 E对称亚带中的微扰系统进行了分析，分别得到了0.013、0.041和0.75 cm-1的矩阵元。ν2振动J = 0时的A-E扭转隧道分裂为-3.26 cm-1，其符号与基态值+9.12 cm-1相反，大小为基态值的三分之一。版权所有1997年学术出版社。版权所有1997年学术出版社
