The 2 1Ag− state and two additional low-lying electronic states of spheroidene newly identified by fluorescence and fluorescence-excitation spectroscopy at 170 K

✍ Scribed by Yasutaka Watanabe; Tadayuki Kameyama; Yousuke Miki; Michitaka Kuki; Yasushi Koyama

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 629 KB
• Volume: 206
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85517-r

✦ Synopsis

Fluorescence and fluorescence-excitation spectroscopy of spheroidene at 170 Kin n-hexane, CSz, and their mixtures has identified the 2 'tL_ state (level I) and two additional electronic states, i.e. one below (level II) and the other above (level IV) the optically allowed 'B: state (level III). The energies of levels I, II, III and IV, determined as absorptive 0~0 transitions, are 14900, 18700,202OO and 24100 cm-' in n-hexane, and 14600, 18000, 18700 and 23400 cm-' in C&. Fluorescence-excitation spectra showed that internal conversion is efficient from level IV to level I, less eftkient from level II to level I, and inefficient from level III to level I.