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RESONANCE RAMAN SPECTRUM OF THE EXCITED 2 1A g STATE OF ß‐CAROTENE
Author(s) -
Noguchi T.,
Kolaczkowski S.,
Arbour C.,
Aramaki S.,
Atkinson G. H.,
Hayashi H.,
Tasumi M.
Publication year - 1989
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 - 10.1111/j.1751-1097.1989.tb04315.x
Subject(s) - excited state , picosecond , resonance (particle physics) , raman spectroscopy , chemistry , resonance raman spectroscopy , spectroscopy , raman scattering , ground state , analytical chemistry (journal) , atomic physics , nuclear magnetic resonance , laser , physics , optics , quantum mechanics , chromatography
— Resonance Raman (RR) bands assignable to the 2 1 A g excited state of ß‐carotene are recorded using picosecond time‐resolved resonance Raman (PTR 3 ) spectroscopy. The RR spectrum contains bands in both the C‐C (1204 cm −1 , 1243 cm −1 , and 1282 cm −1 ) and C=C (1777 cm −1 ) stretching regions. The time‐dependent intensities of these RR features, measured with ˜ 30 ps. resolution, are found (i) to closely correlate with picosecond transient absorption (PTA) data recorded at 575 nm on the same sample and (ii) inversely correlate with the time‐dependent intensities of RR bands assigned to the 1 1 A g ground state. Both of these observations support the assignment of these four RR features to the 2 1 A g excited state. These results remove uncertainties associated with earlier experiments in which excited‐state RR scattering from (3‐carotene was not observed in spite of predicted trends emanating from studies of shorter polyene compounds. The observed C=C band position also agrees with a recent report of this feature.