학술논문
Comparative Absorption Dynamics of the Singlet Excited States of Chlorophylls a and d.
Document Type
Article
Author
Source
Subject
*CHLOROPHYLL
*STIMULATED emission
*FEMTOSECOND lasers
*LASER spectroscopy
*STOKES shift
*TIME-resolved spectroscopy
*CHLOROPHYLL spectra
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Language
ISSN
0006-2979
Abstract
Transient absorption dynamics of chlorophylls a and d dissolved in tetrahydrofuran was measured by the broadband femtosecond laser pump-probe spectroscopy in a spectral range from 400 to 870 nm. The absorption spectra of the excited S1 singlet states of chlorophylls a and d were recorded, and the dynamics of the of the Qy band shift of the stimulated emission (Stokes shift of fluorescence) was determined in a time range from 60 fs to 4 ps. The kinetics of the intramolecular conversion Qx→Qy (electronic transition S2→S1) was measured; the characteristic relaxation time was 54 ± 3 and 45 ± 9 fs for chlorophylls a and d, respectively. [ABSTRACT FROM AUTHOR]