DYNAMIC STOKES SHIFT IN COUMARIN - IS IT ONLY RELAXATION

被引：77

作者：

AGMON, N

机构：

[1] NIDDK,DCRT,PHYS SCI LAB,BETHESDA,MD 20892

[2] NIDDK,CHEM PHYS LAB,BETHESDA,MD 20892

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1990年 / 94卷 / 07期

关键词：

D O I：

10.1021/j100370a041

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：

Picosecond fluorescence spectra of coumarin 153 in solution show transient line narrowing. The peak's frequency shift and its area decay are nonexponential in time. A biexponential fit reveals a correlation between the fast exponents for the shift and area decay at different temperatures. A plot of shift as a function of area is temperature independent at short times. These findings are consistent with an inhomogeneous mechanism for the early part of the dynamic Stokes shift. Several suggested experiments may help distinguish between inhomogeneous and relaxation mechanisms.

引用

页码：2959 / 2963

页数：5

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