ENDOR Investigations on Interstitial Hydrogen and Deuterium Atoms in SrF₂ Crystals

Abstract

Hydrogen and deuterium are incorporated on fluorine sites into CaFZ, SrF2, and BaFZ. The X-irradiation of these crystals produces hydrogen and deuterium atoms on interstitial and substitutional sites. The EPR spectra are well known (1 to 4).Hall and Schumacher (1) investigated the ENDOR spectra of interstitial hydrogen.We looked for ENDOR spectra of S r F :H and S r F :D to get information about the dependence of the hyperfine constants of nuclei in several shells on the lattice constants of alkaline earth fluorides. The measurements were performed with a home-made super-heterodyne spectrometer at 77 and 4 . 2 K.