Premium
Excited‐State Dynamics of All‐ trans ‐Retinal Investigated by Time‐resolved Electronic and Vibrational Spectroscopy #
Author(s) -
Jen Myungsam,
Lee Sebok,
Pang Yoonsoo
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10168
Subject(s) - excited state , intersystem crossing , ultrafast laser spectroscopy , spectroscopy , femtosecond , singlet fission , internal conversion , chemistry , singlet state , raman spectroscopy , triplet state , atomic physics , photochemistry , absorption spectroscopy , molecular physics , spectral line , laser , physics , optics , quantum mechanics , astronomy
Time‐resolved electronic and vibrational spectroscopy has been applied to understand ultrafast excited state dynamics of all‐ trans ‐retinal. Femtosecond transient absorption spectroscopy provides an overview of the excited‐state dynamics of all‐ trans ‐retinal, and femtosecond‐stimulated Raman and infrared absorption measurements, which have not been reported previously, provide further details of the structural changes in the excited states. Three singlet excited states and one triplet excited state have been identified from these experimental results, which are in good agreement with many previous reports. A change in the energy order of the singlet excited state of all‐ trans ‐retinal between in polar and nonpolar solvents abruptly modifies the excited state dynamics. The intersystem crossing to the T 1 state from the S 1 state ( n π * ) almost disappears in polar solvents, whereas the fluorescence from S 3 and S 2 states (ππ * ) is almost absent in nonpolar solvents.