Negative-hydrogen-ion production by backscattering from alkali-metal targets

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Measurements have been made of the total backscattered D/sup -/ and H/sup -/ yields from Cs, Rb, K, Na and Li surfaces bombarded with D/sub 2//sup +/, D/sub 3//sup +/, H/sub 2//sup +/ and H/sub 3//sup +/ in the energy range 0.15 to 4 keV/nucleus. All measurements were made at a background pressure less than 10/sup -9/ Torr and the alkali-metal surfaces were evaporated onto a substrate in situ to minimize contamination of surfaces. For each target, the D/sup -/ and H/sup -/ yields exhibited maxima (as high as 8% per incident deuteron or proton for Cs); the maxima occurred ... continued below

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Pages: 12

Creation Information

Schneider, P.J.; Berkner, K.H.; Graham, W.G.; Pyle, R.V. & Stearns, J.W. November 1, 1979.

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  • Lawrence Berkeley Laboratory
    Publisher Info: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
    Place of Publication: Berkeley, California

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Description

Measurements have been made of the total backscattered D/sup -/ and H/sup -/ yields from Cs, Rb, K, Na and Li surfaces bombarded with D/sub 2//sup +/, D/sub 3//sup +/, H/sub 2//sup +/ and H/sub 3//sup +/ in the energy range 0.15 to 4 keV/nucleus. All measurements were made at a background pressure less than 10/sup -9/ Torr and the alkali-metal surfaces were evaporated onto a substrate in situ to minimize contamination of surfaces. For each target, the D/sup -/ and H/sup -/ yields exhibited maxima (as high as 8% per incident deuteron or proton for Cs); the maxima occurred at incident energies between 300 and 1000 eV/nucleus and always occurred at a lower incident energy for H than for D for a given target. Both the H/sup -/ and D/sup -/ yields decreased, at any measured energy, in going from Cs to Li in the order given above. Measurements of the H/sup -/ yield were also made for H/sub 3//sup +/ bombarding a W substrate, as a function of the work function of the target, as Li was deposited on the W. The work function of the target showed a minimum as the Li coverage was increased and the H/sup -/ yield showed a corresponding maximum which was almost two orders of magnitude higher than the H/sup -/ yield for a thick Li target.

Physical Description

Pages: 12

Notes

Dep. NTIS, PC A02/MF A01.

Source

  • Workshop on hydrogen recycling, Livermore, CA, USA, 17 Oct 1979

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  • Report No.: LBL-9992
  • Report No.: CONF-791057-2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5653633
  • Archival Resource Key: ark:/67531/metadc1089739

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Creation Date

  • November 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 24, 2018, 4:48 p.m.

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Schneider, P.J.; Berkner, K.H.; Graham, W.G.; Pyle, R.V. & Stearns, J.W. Negative-hydrogen-ion production by backscattering from alkali-metal targets, article, November 1, 1979; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1089739/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.