MOLECULAR-DYNAMICS OF BETA-CAROTENE IN SOLUTION MEASURED BY SUBPICOSECOND TRANSIENT OPTICAL KERR EFFECT

被引:16
作者
FOGGI, P [1 ]
RIGHINI, R [1 ]
TORRE, R [1 ]
KAMALOV, VF [1 ]
机构
[1] ACAD SCI USSR,INST CHEM PHYS,DEPT PHOTOCHEM,MOSCOW 117977,USSR
关键词
D O I
10.1016/0009-2614(92)85677-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Optical anisotropy was created and detected in diluted solutions of all-trans beta-carotene in n-dodecane by femtosecond pump and probe pulses. At low pump intensity the anisotropy is due to photoselection produced by one-photon absorption, and it decays with the lifetime (8 ps) of the lowest electronic excited state of beta-carotene. At high pump intensity optical Kerr effect can be detected thanks to the amplification of the solute non-linear susceptibility due to the resonance of the probe beam with the first electronic transition of beta-carotene. Besides the instantaneous electronic response, two relaxation times (250 fs and 215 ps) are observed and attributed to the dynamics of beta-carotene molecules in the ground electronic state.
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页码:23 / 29
页数:7
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