ENDOR study of the H center in LiF

An ENDOR study of the H center in LiF has been performed. Hyperfine constants for 10 sets of nonequivalent neighboring nuclei have been determined by fitting the data with a spin Hamiltonian. The results of this study show that the H center is an F2- molecule ion which is oriented along a a110a direction and located on an F- lattice site, and which is associated with a Na+ impurity. © 1969 The American Physical Society.