Dynamics of ground and excited state chlorophyll a molecules in pyridine solution probed by femtosecond transient absorption spectroscopy

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• 作者：Martinsson ; Peter ; Oksanen ; Jari A.I. ; Hilgendorff ; Marcus ; Hynninen ; Paavo H. ; Sundströ ; m ; Villy ; et. al.
• 刊名：Chemical Physics Letters
• 出版年：1999
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：August 20, 1999
• 卷：309
• 期：5-6
• 页码：386-394
• 文件大小：227 K

摘要

Femtosecond pump–probe spectroscopy was used to investigate the ground and excited state dynamics of chlorophyll a (Chl a) in pyridine following excitation by a 100 fs optical pulse. The transient absorption spectrum and kinetics reveal spectral evolution on two ultrafast time scales: 100 fs and 3 ps. We attribute these dynamics to ground-state transient hole-burning and solvation dynamics. Transient absorption anisotropy at early times (500 fs) was measured for Chl a in pyridine and shows a pronounced wavelength dependence, where anisotropy varies between 0 and 0.5. Strong contribution from excited state absorption is the origin of the variation.