Abstract
We conclude from the close agreement between low-energy electron diffraction calculations and experiment that sulfur adsorbed in a c (2 × 2) structure on Ni (001) is located 1.30 ± 0.1 Å above the surface in a four- fold coordinated bonding site. This location corresponds to a Ni-S bond length which is smaller than occurs in several bulk compounds or than suggested in a previous calculation by Duke et al.
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