Formation processes and secondary emission coefficients for H/sup -/ production on alkali-coated surfaces

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The formation of negative ions by hydrogen collisions on cesium-coated surfaces is discussed in the limiting cases where the resident cesium is either in the purely ionic state or in the purely atomic state. The survival fraction for negative ions moving away from a metal surface is calculated using a method employing complex eigenvalues. The fraction of surviving ions is found to be larger than calculated by previous workers. The secondary emission coefficient for negative ion production by incident atoms with energies of ten to one hundred electron volts is estimated to be in the range thirty to fifty percent. ... continued below

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Pages: 7

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Hiskes, J.R. & Karo, A. September 20, 1977.

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

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The formation of negative ions by hydrogen collisions on cesium-coated surfaces is discussed in the limiting cases where the resident cesium is either in the purely ionic state or in the purely atomic state. The survival fraction for negative ions moving away from a metal surface is calculated using a method employing complex eigenvalues. The fraction of surviving ions is found to be larger than calculated by previous workers. The secondary emission coefficient for negative ion production by incident atoms with energies of ten to one hundred electron volts is estimated to be in the range thirty to fifty percent. The secondary emission coefficient is found to be a sensitive function of the thickness of the alkali adsorbate coating for ion energies in the range below a few hundred electron volts.

Physical Description

Pages: 7

Notes

Dep. NTIS, PC A02/MF A01.

Source

  • Symposium on the production and neutralization of negative hydrogen ions and beams, Upton, NY, USA, 26 Sep 1977

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  • Report No.: UCRL-80098
  • Report No.: CONF-770940-4
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5261757
  • Archival Resource Key: ark:/67531/metadc1074337

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Office of Scientific & Technical Information Technical Reports

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  • September 20, 1977

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 8, 2018, 7:18 p.m.

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Hiskes, J.R. & Karo, A. Formation processes and secondary emission coefficients for H/sup -/ production on alkali-coated surfaces, article, September 20, 1977; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1074337/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.