The interaction of oxygen with Pt{110}(1×2) has been investigated using supersonic molecular beams and low-energy electron diffraction (LEED) at incident kinetic energies of 60–900 meV and surface temperatures from 170 to 1100 K. LEED studies indicate that at low exposures and low beam energies (<190 meV) oxygen does not induce a reconstruction to (1×1). However at high exposures and low beam energies, a variable unit mesh dimension Frenkel–Kontorova domain structure is observed. Sticking probability measurements on the clean surface indicate that oxygen dissociative adsorption on Pt{110}(1×2) is a predominantly precursor mediated process. At low surface temperatures (<200 K) and low beam energies, the precursor has a strong influence on the adsorption kinetics, and mixed islands of dioxygen and adatoms are formed. Adsorption at beam temperatures below 880 K produces two states in the the thermal desorption spectroscopy spectra, but at higher incident gas temperatures a new high temperature desorption state (Tp=1020 K) can be populated, which inhibits the formation of the usual dissociatively chemisorbed states at Tp=720 and 820 K.
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Walker et al. (1998) studied this question.