Adsorption of benzene on platinum black. A neutron scattering study
Abstract
Incoherent inelastic neutron scattering spectra (0–1000 cm–1) of benzene adsorbed on platinum black (0.1 ⩽θ⩽ 2.0) are reported. The spectra, which vary markedly with coverage, indicate that the plane of the C6H6 molecule is lying parallel to the metal surface. Shifts in the low-wavenumber intramolecular modes also indicate that the interaction of C6H6 is stronger with platinum than with nickel. Some of the vibrations of adsorbed C6H6 relative to the substrate have been assigned, e.g. at θ= 0.75 the Pt—C6H6 stretching and tilting modes occur at 522 and 638 cm–1, respectively.