Vibrational and Vibronic Structure in the Valence Electron Spectra of CH3X Molecules (X=F, Cl, Br, I, OH)
- 1 November 1977
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. 16 (5-6) , 225-234
- https://doi.org/10.1088/0031-8949/16/5-6/010
Abstract
Valence electron spectra of the methyl halides and of methyl alcohol have been induced by means of the HeI resonance radiation at 21.22 eV. A large number of new vibrational bands are reported. The observation of these was facilitated by a high instrumental resolving power and fast data acquisition. In most cases the new bands are observed in 1 A 1→2 E transitions but also the electron band of the 1 A 1→2 A 1 transition of CH3I exhibits extensive progressions of closely spaced vibrational bands not previously reported. The vibrational structure of the 1 A 1→2 E transitions is affected by vibronic coupling. The structure of the 2e electron band of CH3Cl probably reflects the operation of the Ham effect. Calculations of the band structure including spin-orbit coupling are performed according to a model which is briefly described.Keywords
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