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LIGHT‐INDUCED LINEAR ACTION DICHROISM IN PHOTOREVERSIBLY PHOTOCHROMIC SENSOR PIGMENTS—I. THEORY
Author(s) -
Björn Lars Olof
Publication year - 1981
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.1751-1097.1981.tb05478.x
Subject(s) - phytochrome , linear dichroism , photochromism , molecule , circular dichroism , dichroism , pigment , action spectrum , chemistry , circular polarization , polarization (electrochemistry) , photochemistry , optics , physics , red light , crystallography , botany , biology , organic chemistry , microstrip
— With a photoreversibly photochromic regulator pigment such as phytochrome, linear action dichroism could theoretically be obtained after photoselection even if the molecules are initially randomly oriented: If randomly oriented P fr (fed‐absorbing phytochrome) molecules are partially converted to P fr (far‐red absorbing phytochrome) molecules by plane‐polarized red light, those molecules will preferentially be converted which have their ‘red’ transition moments nearly parallel to the electric vector of the red light. The effect of subsequent plane‐polarized far‐red light will depend on the plane of polarization. A general theory is developed for how this can be used to determine whether or not the transition moment changes direction during conversion. The pigment need not be isolated, since only physiological reactions (such as germination or chromatic adaptation) are measured.