標題: Time-Resolved Spectroscopy of Ultrafast Photoisomerization of Octopus Rhodopsin under Photoexcitation
作者: Yabushita, Atsushi
Kobayashi, Takayoshi
Tsuda, Motoyuki
電子物理學系
Department of Electrophysics
公開日期: 16-Feb-2012
摘要: A primary process in vision is the cis-trans photoisomerization of a chromophore of rhodopsin, called retinal. In the present work, we have performed ultrafast time-resolved spectroscopy of octopus rhodopsin. using a sub-5-fs pulse laser. In comparison with our previous study on bacteriorhodopsin, we found that octopus rhodopsin follows similar dynamics after photoexcitation but with different time constants. Spectrogram analysis showed that a C=N stretching mode appeared directly after photoexcitation. After reaching the conical intersection region at 80 fs, the overlapping hydrogen out-of-plane and in-plane C=C-H modes emerged as distinct peaks at similar to 200 fs, finishing a rapid relaxation along the coordinate related with these modes. The intensities of these peaks and a C=C stretching mode were found to be modulated at a period of similar to 500 fs, reflecting torsional motion around the C=C double bond before thermalization with the distribution of structural variations in the all-trans structure in configuration space.
URI: http://dx.doi.org/10.1021/jp209356s
http://hdl.handle.net/11536/15628
ISSN: 1520-6106
DOI: 10.1021/jp209356s
期刊: JOURNAL OF PHYSICAL CHEMISTRY B
Volume: 116
Issue: 6
起始頁: 1920
結束頁: 1926
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