Vibronic coupling and intramolecular dynamics of pyrene as revealed by the S0→S2 excitation spectrum in a supersonic jet

✍ Scribed by Nobuhiro Ohta; Hiroaki Baba; Giancarlo Marconi

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 664 KB
• Volume: 133
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(87)87055-0

✦ Synopsis

The fluorescence excitation spectrum of pyrene obtained in a supersonic jet for the S ,_,-+Sz transition shows a complicated structure due to the interaction of discrete levels of S, with the quasi-continuous levels belonging to S,. The intensity distribution pattern in this region has been evaluated from quantum-mechanically calculated quantities, such as the vibronic coupling integrals, and Franck-Condon factors deduced from independent experiments. The dynamics in pyrene following excitation into Sz are discussed.