Abstract
Adsorbed states of π-bonded ethylene at 250 K and ethynyl at 300 K on a Pd(110) surface have been studied by scanning tunneling microscopy (STM). Adsorbed π-bonded ethylene occupies an on-top site of the Pd atom. On the other hand, ethynyl exhibits a pair of depressed spots at both sides, located in the neighbor Pd rows. with a protrusive part between them. At low coverage, π-bonded ethylene molecules form a one-dimensional (3 × 1) structure, which reflects the anisotropic intermolecular interactions, while ethynyl species do not form an ordered structure.
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