Resonant charge-exchange studies with hyperthermal-energy ion beams: development of multi-detection capabilities and a data acquisition system. Final report, 15 November 1986-14 May 1988
The overall research program described in this report is to investigate the interactions of hyperthermal (10-100 eV) and keV ions with clean and adsorbate-covered metal surfaces. Particular emphasis is placed on the study of ion-surface charge-exchange processes. Progress in instrumentation includes: completion of the general apparatus, the successful production of low phase-space alkali and noble-gas beams ranging in energy from about 10 eV to several keV, completion of two hemispherical analyzers for detecting scattered ions (one with high-resolution capabilities, the other for large angle scattering studies), design details of the position-sensitive pulse-counting detectors for multi-energy detection, and the configuration of a Macintosh II-based data-acquisition system. Scientific progress includes: measurements of 50-eV to 4-keV alkali scattering from clean and cesiated Cu(110), simulations using Hartree-Fock pair potentials that give good agreement with the 100- to 400-eV Na(+) scattering from Cu(110), trajectory analysis to identify peaks in the Na(+) energy spectra, measurements of charge-transfer probabilities for alkalis scattered from (Cu(110)) with low coverages (<1/10 monolayer) of Cs adsorbates, and ongoing development of a model that includes both local and collective effects of the Cs overlayers in determining charge transfer probabilities.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA). Lab. of Atomic and Solid State Physics
- OSTI ID:
- 6066559
- Report Number(s):
- AD-A-201236/7/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER
SURFACES
METALS
ION COLLISIONS
CESIUM
DATA ACQUISITION
DETECTION
ELECTROSTATICS
HARTREE-FOCK METHOD
ION BEAMS
ION EXCHANGE
IONS
PROBABILITY
PRODUCTION
PROGRESS REPORT
RESONANCE
SCATTERING
SODIUM IONS
TRAJECTORIES
ALKALI METALS
BEAMS
CHARGED PARTICLES
COLLISIONS
DOCUMENT TYPES
ELEMENTS
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena