Interaction of low-energy electrons with SO[sub 2] layers on Ag(111): Comparison to photochemistry
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Univ. of Texas, Austin (United States)
- Oklahoma State Univ., Stillwater (United States)
The interaction of low-energy electrons (8-54eV) with SO[sub 2] layers on Ag(111) has been studied using temperature programmed desorption (TPD) and Auger electron spectroscopy (AES). For coverages up to one monolayer, the only electron-stimulated desorption (ESD) process is parent desorption, which has a cross section of 3.6 [+-] 0.8 [times] 10[sup [minus]17] cm[sup 2] using 54 [+-] 1 eV electrons. This ESD process has an electron energy threshold of 18.0 [+-] 1.0 eV corresponding to ionization of the 6a[sub 1] molecular orbital of adsorbed SO[sub 2]. For coverages greater than one monolayer, ESD is accompanied by electron-induced decomposition (EID) and the total cross section for loss of SO[sub 2] is [approx] 10[sup [minus]16]cm[sup 2] independent of coverage up to 8 monolayers (ML). The differences between chemisorbed and physisorbed layers is attributed mainly to metal-induced quenching of electronically excited adsorbates, which is less important for those SO[sub 2] molecules further from the metal. Compared to photon-driven desorption, electron-driven desorption follows a different excitation pathway, which we attribute to the formation of transient positive ions. 47 refs., 11 figs., 1 tab.
- OSTI ID:
- 6521281
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:4; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
AUGER ELECTRON SPECTROSCOPY
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISORPTION
CHEMISTRY
COLLISIONS
DESORPTION
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
IONIZATION
IONS
LAYERS
LEPTONS
METALS
MILLER INDICES
MOLECULE COLLISIONS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
QUENCHING
SEPARATION PROCESSES
SILVER
SORPTION
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
TRANSITION ELEMENTS
74 ATOMIC AND MOLECULAR PHYSICS
AUGER ELECTRON SPECTROSCOPY
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISORPTION
CHEMISTRY
COLLISIONS
DESORPTION
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
IONIZATION
IONS
LAYERS
LEPTONS
METALS
MILLER INDICES
MOLECULE COLLISIONS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
QUENCHING
SEPARATION PROCESSES
SILVER
SORPTION
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
TRANSITION ELEMENTS