AN ULTRAFAST ONE-PHOTON AND 2-PHOTON TRANSIENT ABSORPTION STUDY OF THE SOLVENT-DEPENDENT PHOTOPHYSICS IN ALL-TRANS RETINAL

Authors
LARSON EJ FRIESEN LA JOHNSON CK
Citation
Ej. Larson et al., AN ULTRAFAST ONE-PHOTON AND 2-PHOTON TRANSIENT ABSORPTION STUDY OF THE SOLVENT-DEPENDENT PHOTOPHYSICS IN ALL-TRANS RETINAL, Chemical physics letters, 265(1-2), 1997, pp. 161-168
Citations number
19
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
265
Issue
1-2
Year of publication
1997
Pages
161 - 168
Database
ISI
SICI code
0009-2614(1997)265:1-2<161:AUOA2T>2.0.ZU;2-O
Abstract
Ultrafast transient absorption has been measured for all-trans retinal in hexane and ethanol with 150 fs time resolution. Excitation by one- photon absorption at 400 nm or two-photon absorption at 800 nm allows selection of the initially populated state. One-photon excitation lead s to decays in 300 fs to 2 ps in hexane and about 2 ps in ethanol. On a longer time scale, intersystem crossing is observed in about 30 ps i n both solvents even though the order of the two lowest excited single t states is reversed. A model of the photophysics of all-trans retinal in both solvents is presented.