Direct vibrational spectroscopic observations of mixed long range and short range adsorbate interactions: The K+CO interaction on Ni(111)

Abstract

IR reflection-absorption spectroscopy has been employed to study K–CO interactions on Ni(111) at high resolution. It has been found that a mixture of long range and short range interactions are discernible. An ensemble of as many as ∼25 CO molecule/K is affected by the long range K⋅ ⋅ ⋅CO interaction. In addition, Kδ+x(CO)δ−y complexes produced by short range electrostatic effects are observed, yielding characteristic C–O stretching frequencies.