Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 116, Issue 6, Pages 1920-1926Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp209356s
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Funding
- Japan Science and Technology Agency (JST)
- National Science Council of the Republic of China, Taiwan [NSC 98-2112-M-009-001-MY3, NSC 99-2923-M-009-004-MY3]
- Ministry of Education at National Chiao-Tung University (NCTU)
- Japan Society for the Promotion of Science [JSPS-GASR-14002003]
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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.
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