D − production by multiple charge-transfer collisions in alkaline-earth-metal vapors
1979; American Institute of Physics; Volume: 20; Issue: 1 Linguagem: Inglês
10.1103/physreva.20.54
ISSN0556-2791
AutoresT. J. Morgan, Jordan R. Stone, M. Mayo, Jim Kurose,
Tópico(s)Mass Spectrometry Techniques and Applications
Resumo${\mathrm{D}}^{\ensuremath{-}}$ negative-ion equilibrium fractions of deuterium in collisions with Mg, Ca, Sr, and Ba alkaline-earth-metal vapors have been measured over the energy range 1.25-100 keV. For Ca, Sr, and Ba targets, the yield of ${\mathrm{D}}^{\ensuremath{-}}$ ions is almost completely independent of the identity of the target over the energy range 4-35 keV. At low energies, an abrupt increase in ${\mathrm{D}}^{\ensuremath{-}}$ production is observed for targets of Ca, Sr, and Ba but not Mg, and occurs at approximately the same energy, 4 keV, in all three cases. Possible mechanisms responsible for the structure in ${\mathrm{D}}^{\ensuremath{-}}$ production are discussed.
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