Abstract
The mechanism of the photoisomerization of 9- cis retinal has been studied by nanosecond time-resolved infrared spectroscopy. A cyclohexane solution of 9- cis retinal was photoexcited at 349 nm and the subsequent photodynamics were traced. A singular value decomposition (SVD) analysis of the time-resolved infrared data shows that there are two distinct isomerization pathways. One is the triplet pathway that takes place in the picosecond time regime from 9- cis to all- trans. The other involves the energy transfer between the all- trans triplet state and the 9- cis ground state with the resultant 9- cis triplet state subsequently reproducing the all- trans by fast isomerization on the triplet potential surface . This quantum chain process occurs in the microsecond time regime.
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