State-resolved study of coadsorption effects on the stimulated dissociation of NO2on Pt(111)

A. R. Burns, T. M. Orlando, D. R. Jennison, E. B. Stechel

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2 Citations (Scopus)

Abstract

Stimulated surface processes, which are induced by electronic transitions, are especially sensitive to the presence of coadsorbates. We present here a detailed study of electron (5–350 eV) stimulated dissociation of chemisorbed NO2 on an O-covered Pt (111) surface, utilizing state-resolved laser resonance-ionization detection of the NO gas-phase product. Several dramatic effects on NO2 dissociation occur with increasing O atom coverage (up to θ 0 = 0.75 monolayer). First there is a large (X26) enhancement in the specific dissociation yield. Second, there is a narrowing of the translational energy distributions. A third observation is a distinct propensity (> 4:1 at low J) for populating the upper (Ω = 3/2) over the lower (Ω = 1/2) level of the spin-orbit-splitNO 2IIΩ ground state. The enhanced yield can be understood in terms of increased lifetime(s) due to an O-induced reduction in charge transfer screening. Diminished charge transfer also reduces the vibrational and rotational excitation of the NO product. The spin-orbit propensity might arise from substrate reneutralization of NO+ following Auger decay of the primary excitation.

Original languageEnglish
Pages (from-to)1774-1778
Number of pages5
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume9
Issue number3
DOIs
Publication statusPublished - May 1991

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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