Ultrashort vibronic and thermal relaxation of dye molecules after femtosecond ultraviolet excitation

✍ Scribed by F. Laermer; T. Elsaesser; W. Kaiser

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 542 KB
• Volume: 156
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(89)87112-x

✦ Synopsis

Intra-and inter-molecular relaxation of dye molecules is studied after excitation to high-lying singlet states. The intramolecular redistribution is temporally resolved for the first time and occurs in oxazine 1 with a time constant of 18Ok 20 fs. The high excess energy of 17000 cm-i leads to a high transient temperature and a concomitant time-dependent broadening of the emission spectrum. The cooling of the hot molecules within several picoseconds is observed directly via changes of the emission probability at specific spectral positions.