Transient absorption from the 1Bu+ state of all-trans-beta-carotene newly identified in the near-infrared region.
We have attempted subpicosecond time-resolved absorption spectroscopy of all-trans-beta-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 1Bu+ 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 1Bu+ state.
Zhang
J P
JP
Faculty of Science, Kwansei Gakuin University, Uegehera, Nishinomiya 662-8501, Japan.
Skibsted
L H
LH
Fujii
R
R
Koyama
Y
Y
D002246:Carbon Disulfide / Q000737:chemistry; D002725:Chloroform / Q000737:chemistry; D006586:Hexanes / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D019265:Spectroscopy, Near-Infrared; D019207:beta Carotene / Q000737:chemistry*
D006586:Hexanes; D019207:beta Carotene; C026385:n-hexane; D002725:Chloroform; D002246:Carbon Disulfide