Abstract
The adsorption of hydrogen on transition-metal surface has been studied by both experimental and theoretical methods. Hydrogen adsorbed Ni (111) surface had measured by using slow positron beam apparatus. The positron annihilation γ-ray energy spectra emitted from hydrogen-adsorbed Ni (111) surfaces are analyzed. We have discussed the stability of the disorder phase of adsorbed hydrogens on Ni (111) surfaces. Positron annihilation results showed that the disordered phase is unstable until about 300K.
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