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Title: Negative ion production by backscattering from alkali-metal surfaces bombarded by ions of hydrogen and deuterium

Abstract

Measurements have been made of the total backscattered D/sup -/ and H/sup -/ yields from thick, clean targets of Cs, Rb, K, Na, and Li, bombarded with H/sub 2//sup +/, H/sub 3//sup +/, D/sub 2//sup +/, and D/sub 3//sup +/ with incident energies from 0.15 to 4.0 keV/nucleus. All of the measurements were made at background pressures less than 10/sup -9/ Torr and the alkali-metal targets were evaporated onto a cold substrate (T = 77K) in situ to assure thick, uncontaminated targets. Measurements of the H/sup -/ yield from various transition metal targets with thin coverages of alkali-metals have also been made as a function of the surface work function. The negative ion yields are discussed in terms of the probabilities of reflection of the incident particles, of formation of the negative ion at the surface and of the survival of the negative ion leaving the surface. For each thick alkali-metal target, the negative ion yield measurements have been used in a least squares fit to determine two parameters in a theoretically derived expression for the negative ion yield. The parameters obtained from a thick Na target have been used to calculate the yield from a Cu target with thinmore » coverage of Na (such that the surface work function is equal to thick Na).« less

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
5174124
Report Number(s):
LBL-10616
TRN: 80-014120
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALKALI METALS; ION COLLISIONS; HYDROGEN IONS 1 PLUS; BACKSCATTERING; HYDROGEN IONS 2 PLUS; HYDROGEN IONS 3 PLUS; ANIONS; DEUTERIUM IONS; HYDROGEN IONS 1 MINUS; ION SOURCES; KEV RANGE 01-10; NEUTRAL BEAM SOURCES; SCATTERING; TARGETS; CATIONS; CHARGED PARTICLES; COLLISIONS; ELEMENTS; ENERGY RANGE; HYDROGEN IONS; IONS; KEV RANGE; METALS; MOLECULAR IONS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena; 700205 - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Schneider, P J. Negative ion production by backscattering from alkali-metal surfaces bombarded by ions of hydrogen and deuterium. United States: N. p., 1980. Web. doi:10.2172/5174124.
Schneider, P J. Negative ion production by backscattering from alkali-metal surfaces bombarded by ions of hydrogen and deuterium. United States. https://doi.org/10.2172/5174124
Schneider, P J. 1980. "Negative ion production by backscattering from alkali-metal surfaces bombarded by ions of hydrogen and deuterium". United States. https://doi.org/10.2172/5174124. https://www.osti.gov/servlets/purl/5174124.
@article{osti_5174124,
title = {Negative ion production by backscattering from alkali-metal surfaces bombarded by ions of hydrogen and deuterium},
author = {Schneider, P J},
abstractNote = {Measurements have been made of the total backscattered D/sup -/ and H/sup -/ yields from thick, clean targets of Cs, Rb, K, Na, and Li, bombarded with H/sub 2//sup +/, H/sub 3//sup +/, D/sub 2//sup +/, and D/sub 3//sup +/ with incident energies from 0.15 to 4.0 keV/nucleus. All of the measurements were made at background pressures less than 10/sup -9/ Torr and the alkali-metal targets were evaporated onto a cold substrate (T = 77K) in situ to assure thick, uncontaminated targets. Measurements of the H/sup -/ yield from various transition metal targets with thin coverages of alkali-metals have also been made as a function of the surface work function. The negative ion yields are discussed in terms of the probabilities of reflection of the incident particles, of formation of the negative ion at the surface and of the survival of the negative ion leaving the surface. For each thick alkali-metal target, the negative ion yield measurements have been used in a least squares fit to determine two parameters in a theoretically derived expression for the negative ion yield. The parameters obtained from a thick Na target have been used to calculate the yield from a Cu target with thin coverage of Na (such that the surface work function is equal to thick Na).},
doi = {10.2172/5174124},
url = {https://www.osti.gov/biblio/5174124}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 1980},
month = {Sat Mar 01 00:00:00 EST 1980}
}