Internal-conversion and radiative-transition processes among the 1B u+, 1B u− and 2A g− states of all- trans-neurosporene as revealed by subpicosecond time-resolved Raman spectroscopy

• Published in: Chemical physics letters Vol. 357; no. 5; pp. 376 - 384
• Main Authors: Rondonuwu, Ferdy S., Watanabe, Yasutaka, Zhang, Jian-Ping, Furuichi, Kentaro, Koyama, Yasushi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2002; Elsevier Science
• Subjects: Atomic and molecular physics; Exact sciences and technology; Molecular properties and interactions with photons; Molecular spectra; Physics; Raman and rayleigh spectra (including optical scattering); Radiative transition; Raman spectra; Conjugated polyenic compound; Vibrational relaxation; Rhodospirillaceae; Experimental study; Nonradiative transitions; Rhodospirillales; Time resolved spectroscopy; Carotenoids; Stimulated emission; Rhodobacter sphaeroides; Subpicosecond; Bacteria; Internal conversion; Rhodospirillineae; Organic compounds
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/S0009-2614(02)00491-8

The entire Raman spectra of the 1B u +, 1B u − and 2A g − states of carotenoid were recorded, for the first time, in all- trans-neurosporene by means of subpicosecond time-resolved Raman spectroscopy using stimulated-Raman process. A sequential internal-conversion processes of 1B u +→1B u −→2A g − as well as vibrational-relaxation processes in the 1B u + and 2A g − states were identified by the use of a key CC stretching Raman line of each excited state. On the other hand, radiative transitions of 1B u +→2A g − and 1B u −→2A g − were identified by the accompanying 2A g −, CC stretching Raman lines.