Narrowing of ESR Spectra of the E0 Center in Crushed Quartz by Thermal Annealing
نویسندگان
چکیده
The E0 center formed by g-irradiation in crushed quartz has a distribution in the value of the hyperfine fine structure (hfs) constant of 29Si (nuclear spin: I 1=2) and of the g-factor. The widths of both distributions decreased after annealing. The central line due to the E0center associated with 28Si (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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