Adsorbate Induced Reconstruction in the Ni(110)-H System:.

The adsorbate-induced reconstruction of the room temperature Ni(110)-H surface has been resolved by scanning tunneling microscopy. The structure, known as a "streaky" (1x2) from LEED observations, is found to be primarily a (5x2) Ni reconstruction with small domain size along the . Top layer Ni atoms are paired along the by a 0.5angstrom lateral displacement to form tetramers and every fifth row is missing. The barrier height, measured simultaneously with a constant current topograph, is found to be higher along the missing rows.