Build-up of T—T absorption of acridine following singlet excitation with a picosecond pulse

✍ Scribed by Yoshinori Hirata; Ikuzo Tanaka

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 314 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(76)80824-x

✦ Synopsis

The build-up of triplet-triplet absorption at 430 nm has been measured by the picosecond spectroscopy method. The rate constant For the build-up of the T1 state in iso+ctane was determined to bc 8 X lOLo s-l _ The fast intersystem crossing indicates the presence of the Tg(mr*) state below S1_ 1. introduction Most aza-aromatic compounds, except for quinoline and acridine, are very weakly fluorescent. This is due to the presence of both na* and XT* levels in the azaaromatics. The fluorescence properties of these molecules are affected by the position of nn* and ITIT* levels in the mclecular energy diagram and particularly by the character of the first excited singlet state. An