Photochemistry of SO sub 2 on Ag(111)
Journal Article
·
· Journal of Chemical Physics; (United States)
- Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas (USA)
The thermal and photon-induced chemistry of SO{sub 2} on Ag(111) has been studied using temperature programmed desorption (TPD), Auger electron spectroscopy (AES), and work function change ({Delta}{Phi}). SO{sub 2} adsorbs reversibly on Ag(111) and desorbs in peaks at 180 and 130 K for monolayer and multilayer, respectively. The work function increases to 0.33 eV upon saturation of the chemisorbed monolayer (ML), but drops to 0.20 eV for a physisorbed multilayer. UV photons (250--542 nm) induce desorption, but not decomposition, of chemisorbed SO{sub 2}. The photodesorption rate is first order in the photon flux, increases linearly with coverage up to 1 ML, but decreases sharply at higher coverages. For coverages up to 1 ML, the photodesorption cross section is (2.8{plus minus}0.2){times}10{sup {minus}20} cm{sup 2} at (313{plus minus}10) nm. The wavelength dependence is consistent with substrate, including bulk plasmon, excitation. Photodesorption mechanisms involving hot electron and hole attachment processes, only in the first monolayer, are discussed.
- OSTI ID:
- 5200097
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:8; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AUGER ELECTRON SPECTROSCOPY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CHEMISTRY
CONTROL
COVERINGS
CROSS SECTIONS
DESORPTION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
FREQUENCY DEPENDENCE
FUNCTIONS
HOLES
HOT PLASMA
LOW TEMPERATURE
METALS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
PLASMA
PLASMONS
QUASI PARTICLES
RADIATIONS
SATURATION
SEPARATION PROCESSES
SILVER
SORPTION
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
VARIATIONS
WORK FUNCTIONS
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AUGER ELECTRON SPECTROSCOPY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CHEMISTRY
CONTROL
COVERINGS
CROSS SECTIONS
DESORPTION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
FREQUENCY DEPENDENCE
FUNCTIONS
HOLES
HOT PLASMA
LOW TEMPERATURE
METALS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
PLASMA
PLASMONS
QUASI PARTICLES
RADIATIONS
SATURATION
SEPARATION PROCESSES
SILVER
SORPTION
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
VARIATIONS
WORK FUNCTIONS