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Transient Absorption from the 1B u + State of All‐ trans ‐β‐carotene Newly Identified in the Near‐infrared Region ¶
Author(s) -
Zhang JianPing,
Skibsted Leif H.,
Fujii Ritsuko,
Koyama Yasushi
Publication year - 2001
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/0031-8655(2001)0730219taftus2.0.co2
Subject(s) - ultrafast laser spectroscopy , absorption (acoustics) , photon upconversion , spectroscopy , infrared , fluorescence , absorption spectroscopy , chemistry , transient (computer programming) , infrared spectroscopy , photochemistry , excitation , analytical chemistry (journal) , materials science , optoelectronics , optics , luminescence , physics , chromatography , organic chemistry , quantum mechanics , computer science , operating system , composite material
We have attempted subpicosecond time‐resolved absorption spectroscopy of all‐ trans ‐β‐carotene in organic solvents in the 820–1060 nm region and found novel transient absorption features which lived in subpicosecond time scales. A first component that appeared immediately after excitation showed a lifetime of 190 ± 10 fs in n ‐hexane in agreement with the 1B u + lifetime that had been determined by fluorescence upconversion spectroscopy (195 ± 10 fs). (Kandori et al. [1994] J. Am. Chem. Soc. 116, 2671–2672.) Therefore, this component is assigned to a transient absorption from the 1B u + state.