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Comment on g ‐Shifts in the Electron Paramagnetic Resonance of F‐Centers
Author(s) -
Hughes F.
Publication year - 1964
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.19640050106
Subject(s) - hyperfine structure , sign (mathematics) , electron paramagnetic resonance , atomic physics , electron , paramagnetism , electron nuclear double resonance , resonance (particle physics) , spin (aerodynamics) , physics , chemistry , nuclear magnetic resonance , condensed matter physics , quantum mechanics , mathematical analysis , mathematics , thermodynamics
A critical discussion is given of the recent calculations for the theoretical g ‐shift in the electron paramagnetic resonance of F‐centers which is induced by nuclear hyperfine interactions. For cases requiring only the use of the contact hyperfine term of the first shell of nuclei, the computed g ‐shift is found to be too small to be of interest. For F‐centers with large anisotropic hyperfine interaction constants, the concept of a hyperfine‐induced g ‐shift may be given meaning only in terms of an electron‐nuclear double resonance experiment Under these circumstances, the experimentally observed hyperfine g ‐shifts are comparable, to the shifts induced by spin‐orbit effects, but the theoretical computation would require an extensive computer program. It is noted that the computation of such g ‐shifts is of only formal interest, since the sign of the experimentally determined g ‐shift is not a positive definite criterion for assignment of the sign of the electronic charge of a paramagnetic radical.