Bonding of Molecular Solids Probed by Low-Energy H~+ Scattering. Water and Oxygen on Pt(111)

摘要

Low-energy H~+ ions are scattered from condensed O_2 and H_2O layers formed on the Pt(111) surface in order to investigate the nature of bonding of molecular solids on the basis of the neutralization of H~+. Tjhe H~+ yield from the H_2O layer is found to be less than 1/60 of that from the O_2 layer. This is because the Is hole of H~+ tends to be localized in the physisorbed O_2 molecule, whereas the valence hole is rather delocalized in solid H_2O due to hydrogen bonds with a considerable covalent character.