Jet-Cooled Multiphoton Ionization Spectroscopy of the iso-Butanal 3s←n Rydberg Transition

We report the results of a study on the vibrational structure in the (n, 3s) Rydberg state of iso-butanal, carried out via 2+1 multiphoton ionization spectroscopy in a supersonic expansion. Spectra were recorded for both the normal species, (CH3)2CHCHO, and the deuterated isotopomer, (CH3)2CDCHO. Th...

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Bibliographic Details
Published in:Journal of molecular spectroscopy 2001-03, Vol.206 (1), p.73-82
Main Authors: Metha, G.F, Buntine, M.A, Bradley, A.J, Morrison, R.J.S
Format: Article
Language:English
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Summary:We report the results of a study on the vibrational structure in the (n, 3s) Rydberg state of iso-butanal, carried out via 2+1 multiphoton ionization spectroscopy in a supersonic expansion. Spectra were recorded for both the normal species, (CH3)2CHCHO, and the deuterated isotopomer, (CH3)2CDCHO. The spectra show a complicated vibrational pattern attributable to the gauche (C1) conformer which is known to be 250 cm−1 lower in energy than the more symmetric trans (Cs) conformer. The spectra are dominated by the low-frequency formyl torsion which appears in combination with the two methyl torsions (in-phase and out-of-phase) and with several skeletal modes. Vibrational assignments have been aided by ab initio calculations of the (n, 3s) Rydberg state.
ISSN:0022-2852
1096-083X
DOI:10.1006/jmsp.2000.8293