Jet-Cooled Multiphoton Ionization Spectroscopy of the iso-Butanal 3s←n Rydberg Transition
✍ Scribed by G.F Metha; M.A Buntine; A.J Bradley; R.J.S Morrison
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 328 KB
- Volume
- 206
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
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, (CH 3 ) 2 CHCHO, and the deuterated isotopomer, (CH 3 ) 2 CDCHO. The spectra show a complicated vibrational pattern attributable to the gauche (C 1 ) conformer which is known to be 250 cm -1 lower in energy than the more symmetric trans (C s ) 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.