PMDR studies of the radiative mechanism in 3ππ∗ aromatic carbonyls; vibronic band dependence of the radiative decay rates
✍ Scribed by Edward T. Harrigan; Noboru Hirota
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 500 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The radiative decay rates of the 3rr,* states of coumarin, piperonal and 4-methoxybenzaldehyde were determined at the O-O, and different vibronic bands involving both totally and non-totally symmetric vibrations.
The emission from the z and x sublevels is primarily due to the mixing of the 3nrr* state, but the main mixing mechanism depends strongly on the individual system. It is concluded that vibronic mixing is most important in coumarin, whereas direct mixing is more important in piperonal and 4-methoxybenzaldehyde.
The emission from the y sublevel is the property of the 3rrn* state and is likely to be due to the coupling with the 'UT* state.