Abstract
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).
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