Abstract
The positron annihilation γ-ray spectra emitted from clean and hydrogen adsorbed Ni(111) surfaces are measured. We have discussed the disordered structures of adsorbed-hydrogens on Ni(111) surface studied by the positron annihilation spectra and reemitted slow positrons. The present experiments suggest the presence of the positronium hydride, PsH, on hydrogen-saturatedly adsorbed Ni(111) surface.
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