抄録
We have performed the measurement of reemitted slow-positron spectroscopy for the clean Ni(111) surface and hydrogen adsorbed Ni(111) surface. It is suggested strongly that the disordered hydrogen-adsorbed structure of the β1state contains many vacancy-like defects. It is reported that increase of the reemitted slow positron yield in the (2×2)-2H superstructure on Ni(111), in comparison with that from clean Ni(111) surface, is much related to increase of the electron work function due to the hydrogen adsorption.
