Origin and excitation mechanism of electron-stimulated desorption of H/sup +/ from Nb(110) and O-contaminated Nb(100) and Ta(110) surfaces
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Electron-stimulated desorption of H/sup +/ from a pure H adsorbate on a foil-recrystallized Nb(110) surface and from a mixture of H/sub 2/ and H/sub 2/O on O-contaminated Nb(100) and Ta(110) surfaces is studied as a function of electron-impact energy and ion energy. In the former case, it is found that the desorption of H/sup +/ has a low but detectable yield and is proceeded most likely via the excitation of the bonding (valence) electron. In the latter case, two distinguishable types of H/sup +/ ions are observed. Their desorption is shown to proceed via the creation of the highest-lying metal and the O 2s core holes, respectively, indicating two different origins of H/sup +/, namely, on OH or hydroxyl species and single H atoms bonded to the metals.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 6724215
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 26:4; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CATIONS
CHARGED PARTICLES
COLLISIONS
CRYSTALS
DATA
DESORPTION
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FOILS
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
HYDROXYL RADICALS
INFORMATION
IONS
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
MULTIPOLES
NIOBIUM
NONMETALS
NUMERICAL DATA
OXYGEN
QUADRUPOLES
RADICALS
SORPTION
SORPTIVE PROPERTIES
SPECTROMETERS
SPECTROSCOPY
SURFACE PROPERTIES
TANTALUM
TRANSITION ELEMENTS
ULTRAHIGH VACUUM
360104* -- Metals & Alloys-- Physical Properties
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CATIONS
CHARGED PARTICLES
COLLISIONS
CRYSTALS
DATA
DESORPTION
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FOILS
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
HYDROXYL RADICALS
INFORMATION
IONS
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
MULTIPOLES
NIOBIUM
NONMETALS
NUMERICAL DATA
OXYGEN
QUADRUPOLES
RADICALS
SORPTION
SORPTIVE PROPERTIES
SPECTROMETERS
SPECTROSCOPY
SURFACE PROPERTIES
TANTALUM
TRANSITION ELEMENTS
ULTRAHIGH VACUUM