A SEARCH FOR SUBPICOSECOND ABSORPTION COMPONENTS IN PHOTOSYSTEM-II REACTION CENTERS

被引:15
作者
MCCAULEY, SW
BARONAVSKI, AP
RICE, JK
GHIRARDI, ML
MATTOO, AK
机构
[1] USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375
[2] USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE AGR RES CTR W,PLANT MOLEC BIOL LAB,BELTSVILLE,MD 20705
关键词
D O I
10.1016/0009-2614(92)80024-6
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
The transient absorption kinetics of spinach photosystem II reaction centers were measured at 672 nm (detection bandwidth almost-equal-to 11 nm) following excitation at 310 nm. A temporal resolution of almost-equal-to 50 fs was used which is three times higher resolution than the current literature value. We observed a very fast absorption decrease with a rise time of 150 +/- 15 fs followed by a 13 +/- 4 ps recovery. The kinetics of the recovery step did not reveal a 3 ps component, however, a slight break in the data suggests a more complicated fit may explain the data as well or better. Based on a comparison of the rise time reported here and those reported by Durrant et al., the relaxation from S(n) to S(l) occurs very rapidly, within the 150 fs initial absorption decrease.
引用
收藏
页码:437 / 442
页数:6
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