TY - JOUR
T1 - The very early events following photoexcitation of carotenoids
AU - Hashimoto, Hideki
AU - Yanagi, Kazuhiro
AU - Yoshizawa, Masayuki
AU - Polli, Dario
AU - Cerullo, Giulio
AU - Lanzani, Guglielmo
AU - De Silvestri, Sandro
AU - Gardiner, Alastair T.
AU - Cogdell, Richard J.
N1 - Funding Information:
H.H. and M.Y. thank the Grant-in-aid from Japanese Ministry of Education, Culture, Sports, Science and Technology (Grants Nos. 14340089, 14340090, and 14654072). H.H. and R.J.C. thank the Grant-in-aid from BBSRC and NEDO International Joint-Research. R.J.C. also acknowledges support from the European Community—Access to Research Infrastructure action of improving Human Potential Programme, contract No. HPRI-CT-2001-00148 (Center for Ultrafast Science and Biomedical Optics, CUSBO). This work is supported in part by the grant from Nakatani Electronic Measuring Technology Association of Japan.
PY - 2004/10/1
Y1 - 2004/10/1
N2 - The recent availability of laser pulses with 10-20fs duration, tunable throughout the visible and near infrared wavelengths, has facilitated the investigation, with unprecedented temporal resolution, into the very early events of energy relaxation in carotenoids [Science 298 (2002) 2395; Synth. Metals 139 (2003) 893]. This has enabled us to clearly demonstrate the existence of an additional intermediate state, Sx, lying between the S 2 (11Bu +) and S1 (2 1Ag -) states. In addition, by applying time-resolved stimulated Raman spectroscopy with femtosecond time resolution, it has also been shown that vibrational relaxation in electronic excited states plays an important role in these interconversions. In this mini-review, we describe briefly the current understanding of Sx and the other intermediate excited states that can be formed by relaxation from S2, mainly focusing attention on the above two topics. Emphasis is also placed on some of the major remaining unsolved issues in carotenoid photochemistry.
AB - The recent availability of laser pulses with 10-20fs duration, tunable throughout the visible and near infrared wavelengths, has facilitated the investigation, with unprecedented temporal resolution, into the very early events of energy relaxation in carotenoids [Science 298 (2002) 2395; Synth. Metals 139 (2003) 893]. This has enabled us to clearly demonstrate the existence of an additional intermediate state, Sx, lying between the S 2 (11Bu +) and S1 (2 1Ag -) states. In addition, by applying time-resolved stimulated Raman spectroscopy with femtosecond time resolution, it has also been shown that vibrational relaxation in electronic excited states plays an important role in these interconversions. In this mini-review, we describe briefly the current understanding of Sx and the other intermediate excited states that can be formed by relaxation from S2, mainly focusing attention on the above two topics. Emphasis is also placed on some of the major remaining unsolved issues in carotenoid photochemistry.
KW - Carotenoids
KW - Excited state
KW - Lycopene
KW - Mini- and macro-β-carotenes
KW - Neurosporene
KW - Stimulated Raman
KW - Sub-20 femtosecond
KW - Time-resolved absorption
KW - Vibrational relaxation
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U2 - 10.1016/j.abb.2004.04.022
DO - 10.1016/j.abb.2004.04.022
M3 - Short survey
C2 - 15325912
AN - SCOPUS:4344585305
SN - 0003-9861
VL - 430
SP - 61
EP - 69
JO - Archives of Biochemistry and Biophysics
JF - Archives of Biochemistry and Biophysics
IS - 1
ER -