Microscopic evidence was found for the playing of a prominent role by H in the structure of the NL10 thermal donor. Hyperfine interactions with the 1H nucleus were detected and were analyzed by using electron-nuclear double resonance techniques. It was established that the NL10 defect incorporated one H atom. The quadrupole interaction with the 2H nucleus was also measured in D-doped samples. On the basis of the measurements, it was concluded that the direction of the bond which was formed by D was perpendicular to the <011> O-containing symmetry plane of a thermal donor. On the basis of the current results, the NL10 center was identified with a singly passivated thermal donor in its neutral charge state.

J.V.Martynov, T.Gregorkiewicz, C.A.J.Ammerlaan: Materials Science Forum, 1995, 196-201, 849-54