High-resolution low-energy electron reflection from W(100) using the electron energy-loss spectrometer: a step towards quantitative analysis of surface vibrational spectra
High-resolution low-energy electron-reflection measurements and electron-energy-loss measurements for clean W(100) and for the hydrogen-saturated phase (B(1)) on W(100) are reported. The ability to perform both low-energy reflectance, low energy electron diffraction, and high-resolution electron energy-loss experiments on the same crystal using the same electron optics permits several novel experiments. For example, it is possible to quantitatively test the dipole scattering mechanism and examine dipole and impact loss cross sections under precisely defined scattering conditions (i.e., under diffracted-beam emergence conditions or at energies corresponding to reflectance resonance conditions). Under certain scattering conditions, the dipole scattering selection rule is shown to break down. Suitable modifications of the electron optics control electronics also permit direct measurements of the cross-section energy dependence of vibrational losses. These new features represent an important step towards quantitative applications of vibrational spectroscopy based on comparing electron-energy-loss spectroscopy signals from chemisorbed species on different crystal surfaces.
- Research Organization:
- Texas Univ., Austin (USA). Dept. of Physics
- OSTI ID:
- 5155703
- Report Number(s):
- AD-A-189194/4/XAB
- Resource Relation:
- Other Information: Pub. in Jnl. of Vacuum Science and Technology A, Vol. 5, No. 4, 435-439(Aug 1987)
- Country of Publication:
- United States
- Language:
- English
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High-resolution low-energy electron reflection from W(100) using the electron energy-loss spectrometer: A step towards quantitative analysis of surface vibrational spectra
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HYDROGEN
CHEMISORPTION
SURFACES
ELECTRON DIFFRACTION
TUNGSTEN
CONTROL
CROSS SECTIONS
CRYSTALS
DIPOLES
ELECTRON SPECTROSCOPY
ELECTRONS
ENERGY-LOSS SPECTROSCOPY
LOSSES
METALS
REFLECTION
RESONANCE
SATURATION
SCATTERING
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
LEPTONS
MULTIPOLES
NONMETALS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)