Auger spectroscopy and electronically-stimulated surface processes

D. R. Jennison, A. R. Burns, Ellen Stechel

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Electronic excitations in adsorbate layers stimulate desorption and dissociation of adsorbed molecules as well as chemical reactions between adsorbates. The highest-probability stimulated processes produce neutral desorbates and determine how surface composition is altered by electron or photon radiation. A basic understanding has emerged, due largely to laser resonance-enhanced multi-photon ionization (REMPI) experiments, which provide quantum-state resolution of the gas-phase products. Auger phenomena enter this understanding in several ways. For example, CVV Auger spectroscopy determines the screened hole-hole interaction, U, in adsorbates, which in turn provides insight into the degree of charge-transfer screening from the substrate. In those systems where screening charge is used in excitation Auger decay, screening directly determines the lifetime, which in turn can exponentially affect the yield. Reductions in screening, e.g. induced by coadsorption of electro-negative species, thus can result in giant yield enhancements. As separate issues, a finite U may prevent the fast resonant decay and thus increase the yield from two-hole excitations, as has been suggested for NO2 dissociation on Pt(lll), or may assist in the localization (self-trapping) of two-hole excitations in dense adsorbate layers, as apparently is the case for NO desorption from the same surface. The latter causes the yields from one- and two-hole excitations to differ in their coverage dependence. Finally, CVV Auger spectroscopy, of course, measures the energies of two-hole excitations, which can be correlated with observed stimulated thresholds.

Original languageEnglish (US)
Pages (from-to)36
Number of pages1
JournalPhysica Scripta
Volume1992
Issue numberT41
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

Fingerprint

Auger spectroscopy
Spectroscopy
Excitation
Screening
screening
excitation
Desorption
Photon
desorption
Decay
dissociation
electron radiation
Charge Transfer
photons
decay
Ionization
Quantum State
Trapping
Chemical Reaction
Lifetime

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mathematical Physics
  • Atomic and Molecular Physics, and Optics

Cite this

Auger spectroscopy and electronically-stimulated surface processes. / Jennison, D. R.; Burns, A. R.; Stechel, Ellen.

In: Physica Scripta, Vol. 1992, No. T41, 01.01.1992, p. 36.

Research output: Contribution to journalArticle

Jennison, D. R. ; Burns, A. R. ; Stechel, Ellen. / Auger spectroscopy and electronically-stimulated surface processes. In: Physica Scripta. 1992 ; Vol. 1992, No. T41. pp. 36.
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