Evidence for Oxygen Abstraction from NO₂ upon Thermal Scattering from an Al(111) Surface
Evidence is presented for the existence of a non-adiabatic reaction channel, namely the abstraction of an O atom from a NO₂ mol. upon scattering from an Al(111) surface. This reaction channel was studied by exposing the sample to an NO₂ mol. beam and subsequently analyzing the scattered flux using REMPI spectroscopy. In these expts., a considerable amt. of NO emitted from the surface was detected. The emitted NO has a rotational temp. of ca. 260 K that increases only slowly with surface temp. In summary, these results provide first evidence for the abstraction reaction NO₂(g) → NO(g)+O(a) upon NO₂/Al(111) scattering, which may arise when 2 electrons are rapidly transferred to the incoming mol. while it is unfavorably oriented for concurrent adsorption of both fragments.
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