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Magnetic spin phenomena in the chlorophyll “a” photoconductivity
Author(s) -
Frankevich E. L.,
Tribel M. M.,
Sokolik I. A.,
Kolesnikova L. I.,
Stolovitseii Yu. M.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221070205
Subject(s) - photoconductivity , magnetic field , excited state , impact ionization , materials science , chemistry , condensed matter physics , ionization , atomic physics , optoelectronics , physics , ion , organic chemistry , quantum mechanics
Modulation of the chlorophyll “a” (Chl) photoconductivity by an external magnetic field due to variations of the rate of non‐equilibrium spin processes under the action of a magnetic field is observed. These processes are charge carrier generation and charge detrapping by Chl triplet. Application of a magnetic field causes two types of variations of the photoconductivity of Chl films in vacuum: (i) instantaneous (τ < 1 s ) increase of the photoconductivity and (ii) slow decrease with time constant τ = 10 to 100 s . The influence of temperature and intensity of the exciting light on the magnetic field effects is investigated. A scheme of energy transformation processes in Chl involving electron‐excited and ionized states is presented. The presence of oxygen leads to an increase of the photoconductivity of Chl, as compared with the vacuum values, and to a change in the dependence of photoconductivity on magnetic field. These changes are shown to occur due to the appearance of new acceptor centres arising from unstable products of Chl photooxidation.