Journal of Molecular Spectroscopy ( IF 1.4 ) Pub Date : 2021-02-08 , DOI: 10.1016/j.jms.2021.111421 Thomas Salomon 1 , José L Doménech 2 , Philipp C Schmid 1 , Ernest A Michael 1, 3 , Stephan Schlemmer 1 , Oskar Asvany 1
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A cryogenic 22-pole ion trap apparatus is used in combination with a table-top pulsed IR source to probe weakly bound CH+-He and CH+-He4 complexes by predissociation spectroscopy at 4 K. The infrared photodissociation spectra of the C–H stretching vibrations are recorded in the range of 2720–2800 cm−1. The spectrum of CH+-He exhibits perpendicular transitions of a near prolate top with a band origin at 2745.9 cm−1, and thus confirms it to have a T-shaped structure. For CH+-He4, the C-H stretch along the symmetry axis of this oblate top results in parallel transitions.
中文翻译：
CH+-He 和 CH+-He4 配合物的旋转振动光谱
低温 22 极离子阱装置与台式脉冲红外源结合使用，通过 4 K 的预解离光谱法探测弱结合的 CH + -He 和 CH + -He 4配合物。C– 的红外光解离光谱H 伸缩振动记录在 2720-2800 cm -1的范围内。CH + -He的光谱 表现出近扁长顶部的垂直跃迁，带起点在2745.9 cm -1，因此证实它具有T形结构。对于CH + -He 4，CH 沿该扁顶部的对称轴拉伸导致平行过渡。
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