H/sup -/ and D/sup -/ production by backscattering from surfaces
Three experiments are described in which H/sup -/ or D/sup -/ ions have been produced by backscattering from surfaces coated with alkali metals: (1) Backscattering of H/sup -/ and D/sup -/ produced by 0.15- to 4-keV/nucleus H/sub 2//sup +/, H/sub 3//sup +/, D/sub 2//sup +/, and D/sub 3//sup +/ bombarding clean targets of Cs, Rb, K, Na, and Li. For each target, the H/sup -/ and D/sup -/ yields were maximized at incident energies between 300 and 1200 eV/nucleus and always at a lower incident energy for H than for D on a given target. At any given incident energy, both the H/sup -/ and D/sup -/ yields decreased in going from Cs to Li in the order given above. (2) A Mo surface was bombarded by a low-energy flux of H atoms produced in a tungsten furnace. As the surface work function was reduced by evaporating Cs onto the target, a small fraction (10/sup -9/) of the incident hydrogen atoms was observed as backscattered H/sup -/ ions. (3) Surfaces of Mo, W, Pt, Ni, Cu, Re, Ta, and Pd were bombarded by hydrogen ions produced in a discharge. Two classes of H/sup -/ ions were observed when Cs was added to the discharge - H/sup -/ ions leaving the surface with approximately < 10 eV and H/sup -/ ions leaving the surface with approximately 50 to 100 eV.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6194875
- Report Number(s):
- LBL-12454; CONF-810442-3; ON: DE81023025; TRN: 81-012532
- Resource Relation:
- Conference: Joint workshop on negative ions, Mexico City, Mexico, 1 Apr 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
CESIUM
ION COLLISIONS
DEUTERIUM IONS
COLLISIONS
HYDROGEN IONS 2 PLUS
HYDROGEN IONS 3 PLUS
CHARGE EXCHANGE
LITHIUM
POTASSIUM
RUBIDIUM
SODIUM
COPPER
EXPERIMENTAL DATA
HYDROGEN IONS 1 MINUS
ION BEAMS
KEV RANGE 01-10
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NICKEL
PALLADIUM
PLATINUM
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TUNGSTEN
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ELEMENTS
ENERGY RANGE
HYDROGEN IONS
INFORMATION
IONS
KEV RANGE
METALS
MOLECULAR IONS
NUMERICAL DATA
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TRANSITION ELEMENTS
640301* - Atomic
Molecular & Chemical Physics- Beams & their Reactions