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|Title:||Jet-cooled multiphoton ionization spectroscopy of the iso-butanal 3s←n Rydberg transition|
|Other Titles:||Jet-cooled multiphoton ionization spectroscopy of the iso-butanal 3s <- n Rydberg transition|
|Citation:||Journal of Molecular Spectroscopy, 2001; 206(1):73-82|
|Publisher:||Academic Press Inc|
|G. F. Metha, M. A. Buntine, A. J. Bradley and R. J. S. Morrison|
|Abstract:||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.|
|Keywords:||Multiphoton ionization; iso-butanal (2-methyl propanal); alkyl aldehydes; Rydberg transition; conformer|
|Rights:||Copyright © 2001 Academic Press. All rights reserved.|
|Appears in Collections:||Chemistry publications|
Environment Institute publications
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