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Atomic hydrogen at anion sites in LiFH− and NaH− crystals

Anion hydrogen atom centres are studied by optical and ESR techniques in LiF-H − and NaF-H − crystals. The ESR spectra of these centres are observed after X-ray irradiation of the crystals at 77 K. The optical absorption spectra of H s,a 0 centres consist of two bands at 2.4 and 3.5 eV for LiF-H − and at 2.95 and 3.8 eV for NaF-H − , which are due to the electron charge transfer from a fluorine ion to the 1 s state of the hydrogen atom