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STEADY‐STATE OPTICAL POLARIZATION ANISOTROPY OF RODLIKE MOLECULES UNDERGOING TORSIONAL TWISTING MOTIONS
Author(s) -
Ludescher Richard D.,
Ludescher William H.
Publication year - 1993
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1993.tb04987.x
Subject(s) - anisotropy , polarization (electrochemistry) , molecule , optical anisotropy , molecular physics , materials science , chemical physics , chemistry , physics , optics , quantum mechanics
An analytical expression was derived for the steady‐state optical polarization anisotropy expected for a rodlike molecule undergoing torsional twisting motions about its long molecular axis. This expression is parameterized in terms of the ratio τ/φ where τ is the excited‐state lifetime of the chromophore and Φ is a characteristic time for rotational twisting (Yoshimura et al., J. Mol. Biol . 179 , 453–467, 1984) that is proportional to the torsional rigidity of the flexible rodlike molecule; the amplitude at any given value of τ/φ is also determined by the angle between the chromophore transition dipole and the long molecular axis of the molecule.