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Narrowing of ESR Spectra of the E′ Center in Crushed Quartz by Thermal Annealing
Author(s) -
Hirai M.,
Ikeya M.
Publication year - 1998
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/(sici)1521-3951(199810)209:2<449::aid-pssb449>3.0.co;2-5
Subject(s) - quartz , annealing (glass) , materials science , spectral line , thermal , center (category theory) , nuclear magnetic resonance , composite material , chemistry , crystallography , physics , thermodynamics , astronomy
The E′ center formed by γ‐irradiation in crushed quartz has a distribution in the value of the hyperfine fine structure (hfs) constant of 29 Si (nuclear spin: I = 1/2) and of the g ‐factor. The widths of both distributions decreased after annealing. The central line due to the E′center associated with 28 Si ( I = 0) shows a clear narrowing as to allow the numerical simulation of the distribution of g ‐factor based on the following assumptions. One is that the distribution is composed of Gaussians with various line widths. The other is that the broader component has a small thermal activation energy. The simulated spectrum shows good agreement with the experimental one. The distribution of the g ‐factor can be explained with an inhomogeneous eigenvector of a singly occupied molecular orbital (SOMO).