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Decay processes of electric birefringence in chemically reacting system
Author(s) -
Kobayasi Syoyu
Publication year - 1971
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360100513
Subject(s) - chemistry , isomerization , dipole , electric field , diffusion , birefringence , relaxation (psychology) , anisotropy , reaction rate constant , chemical reaction , molecule , atomic physics , molecular physics , nuclear magnetic resonance , kinetics , thermodynamics , optics , physics , organic chemistry , psychology , social psychology , quantum mechanics , catalysis
Abstract Analytical and numerical calculations of the decay processes of the electric birefringence in an isomerizing system have been performed. Two modes of isomerization are considered: in the first mode, the direction of the axis (of the optical anisotropy) of a molecule is conserved during isomerization; in the second mode, it is not. In the first mode, if G A is not equal to G B , and that, if k A o p A 2 is not equal to k B o p B 2 (when the orienting electric field is weak), in which G A , G B and p A , p b are the optical anisotropy and permanent electric dipole moments, of the molecule in two states A and B of the isomerization, and k A o and k B o are the rate constants for the transitions A → B and B → A, respectively, and if diffusion rates are very much slower than the chemical rates, the relaxation due to the chemical reaction can be detected in the decay of the electric birefringence. In the second mode, if diffusion rates are somewhat slower than the chemical rates, the relaxation due to the chemical reaction appears in the decay, even though there are no differences in optical anisotropy and electric moments in the two states. When the rotary diffusion coefficients are different in the two states, the decay process becomes almost one‐component, bringing the chemical rate about ten times higher to diffusion coefficients in both modes.