H‐Centre in LiF‐H

The H ‐centre in LiF is studied by optical and ESR techniques. The centre is produced by reaction between H and H ‐centres. The H ‐centre ESR spectrum shows three broad lines which are due to the hyperfine interaction of an unpaired electron with the two protons. The resolved superhyperfine structure (as in case of F‐centre) arises from the interaction with the lithium nuclei in a first shell and the fluoride nuclei in a second shell. Optical absorption band of the H ‐centre at 5.05 eV is similar to that of the F‐band, only slightly shifted to higher energies. The centre has the character of molecule‐ion as well as of F‐centre. [Russian Text Ignored].