Abstract
Upon X-irradiation of hydrogen beta alumina at 15K an ESR spectrum is observed that shows the typical hyperfine doublet of atomic hydrogen. With ENDOR measurements, the superhyperfine and quadrupole interactions with Al nuclei could be determined. According to the analysis of the spectra, the hydrogen atom is trapped in the mirror plane of the beta alumina crystal near a bridging O2-(5) ion. From the analysis of the ESR linewidth and the superhyperfine and quadrupole data, it is concluded that the hydrogen atom is bound with a slight covalency to the O2-(5) ion and that one of the normally two Al3+(3) ions above and below the mirror plane is missing.
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