FEMTOSECOND STUDY OF RELAXATION OF HYDRATED CHLOROPHYLL-A AGGREGATE IN HYDROCARBON SOLUTION

被引：10

作者：

HELENIUS, VM

SIIKKI, JO

HYNNINEN, PH

KORPPITOMMOLA, JEI

机构：

[1] UNIV JYVASKYLA,DEPT CHEM,SF-40351 IYVASKYLA,FINLAND

[2] UNIV HELSINKI,DEPT CHEM,SF-00014 HELSINKI,FINLAND

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 226卷 / 1-2期

基金：

芬兰科学院;

关键词：

D O I：

10.1016/0009-2614(94)00693-8

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：

Electronic relaxation of chlorophyll a-water adduct in 3-methylpentane solution has been studied by using femtosecond absorption recovery and picosecond fluorescence measurements. A fast initial lifetime of 1.5 ps and a slower lifetime component of 35 ps are observed. The fast decay of 1.5 ps is assigned to efficient internal conversion and energy transfer and trapping in the chlorophyll a-water adduct. The slower lifetime component is assigned to a localized excitation in the aggregate. No indication of exciton annihilation is observed in the excitation intensity range from 7 x 10(10) to 1 X 10(17) photons/ (pulse cm2).

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页码：137 / 143

页数：7

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