On the mechanism of weak-field coherent control of retinal isomerization in bacteriorhodopsin

被引：32

作者：

Prokhorenko, Valentyn I. ^{[1
,2
]}

Nagy, Andrea M. ^{[1
,2
]}

Brown, Leonid S. ^{[3
]}

Miller, R. J. Dwayne ^{[1
,2
]}

机构：

[1] Univ Toronto, Inst Opt Sci, Dept Chem, Toronto, ON M5S 3H6, Canada

[2] Univ Toronto, Inst Opt Sci, Dept Phys, Toronto, ON M5S 3H6, Canada

[3] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada

来源：

CHEMICAL PHYSICS | 2007年 / 341卷 / 1-3期

关键词：

bacteriorhodopsin coherence; coherent control; femtosecond; isomerization; pump-probe; protein; Raman; retinal; theory;

D O I：

10.1016/j.chemphys.2007.07.031

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：

Experimental studies of the short time reaction dynamics controlling the chemical branching ratio provide direct evidence for the mechanism of coherent control of the retinal photoisomerization in bacteriorhodopsin in the weak-field limit with respect to the previous report [V. Prokhorenko, A. Nagy, S. Waschuk, L. Brown, R. Birge, R. Miller, Science 313 (2006) 1257]. The phase sensitivity of the reaction dynamics is directly revealed using time- and frequency-resolved pump-probe measurements. The high degree of control of the reaction branching ratio is theoretically explained through a combination of spectral amplitude shaping and phase-dependent coupling to selectively excite vibrations most strongly coupled to the reaction coordinate. Coherent control in this context must involve reaction dynamics that occur on time scales comparable to electronic and vibrational decoherence time scales. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：296 / 309

页数：14

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