Abstract
The Xe and Kr collision-induced desorption cross-sections for NO adsorbed on Pt{111} at 100 K are reported as a function of translational energy in the range of 1.9 to 3.8 eV. The minimum energy required for desorption is extracted using extrapolation to the zero of cross-section. The measured threshold energies exhibit total energy scaling for both beams using two angles of incidence, 45° and 15°. The threshold energies required to desorb NO from Pt{111} were determined experimentally to be 2.55 eV and 2.05 eV using Xe or Kr respectively. Using a hard sphere/cube collision model the NO-Pt{111} binding energy was calculated to be 1.12 ± 0.02 eV using either the beam of Xe or Kr. Comparison of this binding energy with the measured activation energy for thermal desorption supports an adsorption/desorption model having no precursor to the chemisorption state.
Published Version
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