Continuous-time core-level photon-stimulated desorption spectroscopy for monitoring soft x-ray-induced reactions of molecules adsorbed on a single-crystal surface

Journal Article · Mon May 15 04:00:00 EDT 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788187

Chou, L -C; Wen, C -R ^[1]

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1. Department of Physics, National Cheng Kung University, Tainan, Taiwan (China)

Continuous-time core-level photon-stimulated desorption (PSD) spectroscopy was proposed for monitoring the soft x-ray-induced reactions of molecules adsorbed on a single-crystal surface. Monochromatic synchrotron radiation was used as a soft x-ray light source in the photon-induced reactions of CF{sub 3}Cl adsorbed on a Si(111)-7x7 surface at 30 K and also as a probe for studying the produced fluorination states of the bonding surface Si atom in the positive-ion PSD spectroscopy. The F{sup +} PSD spectrum was obtained by monitoring the F{sup +} signal as a function of incident photon energy near the Si(2p) edge (98-110 eV). Sequential F{sup +} PSD spectra were measured as a function of photon exposure at four adsorbate coverages (the first dose=0.3x10{sup 15} molecules/cm{sup 2}, the second dose=0.8x10{sup 15} molecules/cm{sup 2}, the third dose=2.2x10{sup 15} molecules/cm{sup 2}, and the fourth dose=3.2x10{sup 15} molecules/cm{sup 2}). For the first and second CF{sub 3}Cl-dosed surfaces, the sequential F{sup +} PSD spectra show the variation of their shapes with photon exposure and indicate the formation of surface SiF species. The sequential F{sup +} PSD spectra for the third and fourth CF{sub 3}Cl-dosed surfaces also show the variation of their shapes with photon exposure and depict the production of surface SiF and SiF{sub 3} species.

• OSTI ID: 20788187
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 19 Vol. 73; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CATIONS
DESORPTION
FLUORINATION
FLUORINE IONS
MOLECULES
MONOCHROMATIC RADIATION
MONOCRYSTALS
PHOTONS
SILICON FLUORIDES
SOFT X RADIATION
SPECTROSCOPY
SURFACES
SYNCHROTRON RADIATION
X-RAY DIFFRACTION