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Two types of F centres in alkaline earth fluoro‐halides II. Double ENDOR experiments
Author(s) -
Niklas J. R.,
Bauer R. U.,
Spaeth J.M.
Publication year - 1983
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.2221190118
Subject(s) - spectral line , halide , chemistry , relaxation (psychology) , nuclear magnetic resonance , atomic physics , molecular physics , crystallography , analytical chemistry (journal) , physics , inorganic chemistry , social psychology , psychology , chromatography , astronomy
In crystals containing simultaneously F(Cl − ) and F(F − ) centres in certain frequency regions the ENDOR spectra are superimposed to such a degree that an analysis is not possible. With double ENDOR experiments the ENDOR spectra of both centres can be separated. The ratio of the ENDOR signal heights compared to the double ENDOR signal heights is found to be characteristic for the shell of the nuclei involved. It can be used to discriminate between ENDOR lines of different shells. The effect cannot be understood on the basis of rate equations with reasonable assumptions for the spin—lattice relaxation times. It is probably due to spin diffusion.