Magnetic Hyperfine and Quadrupole Interactions of F‐Centres in NaCl as Measured by ENDOR

Abstract

(a), V. YA. ZEVIN (b), S. S. ISHCHENKO (a), N. P. BARAN (a), M. A. RUBAN (a), and V. V. TESLENKO (a) The hyperfine and quadrupole interactions of F-centres in NaCl were investigated by the ENDOR method. The constants of hyperfine interactions with nuclei of coordination shells I to X surrounding the vacancy have been determined. The quadrupole interaction with nuclei of shells 11, IV, VI, and VIII has been recorded and measured. General expressions for ENDOR frequencies are given in single-particle approximation, allowance being made for the deviation of the nuclear spin quantization axis from the direction of the constant magnetic field H , and for corrections due to second order perturbation theory. The angular dependence of ENDOR spectra has been investigated in detail and fully explained on the basis of theoretical formulae. The constants were determined at T = 20, 77, and 300 OK. 1nt.rodiictionThe I?-centres in NaCl were investigated by means of the electron nuclear The present work deals with a detailed investigation of magnetic hyperfine and quadrupole interactions of F-centres in NaC1. We discuss also the general expression for ENDOR frequencies in the single-particle approximation.

Spin-Dependent Recombination in Strained Si Under Fields of 1-30 MHz Range

“…When the difference is negative the shape transformation occurs with a non-zero value of the SDR at H 0 =0. A similar result was predicted by Deigen and Roitsin in [13] where it was attributed to the inner field included in the Hamiltonian in contrast to Eqn. 5 which, nevertheless, yields the signal at the null constant field (Fig.…”