Generation of vibrationally excited H/sub 2/ molecules by H/sub 2//sup +/ wall collisions

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The H/sub 2//sup +/ ions from the volume of a hydrogen discharge will strike the discharge chamber walls with a kinetic energy equivalent to the plasma potential. A three-step process is described in which the H/sub 2//sup +/ ions are neutralized in a two-stage Auger process followed by a third stage wall relaxation collision, with the net result that the incident ions are converted to ground state molecules having a broad vibrational excitation spectrum. For kinetic energies ranging from a few electron volts up to twenty electron volts a substantial fraction, approx. = 2/3, of these ions will reflect as ... continued below

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Pages: 9

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Hiskes, J.R. & Karo, A.M. November 11, 1983.

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Description

The H/sub 2//sup +/ ions from the volume of a hydrogen discharge will strike the discharge chamber walls with a kinetic energy equivalent to the plasma potential. A three-step process is described in which the H/sub 2//sup +/ ions are neutralized in a two-stage Auger process followed by a third stage wall relaxation collision, with the net result that the incident ions are converted to ground state molecules having a broad vibrational excitation spectrum. For kinetic energies ranging from a few electron volts up to twenty electron volts a substantial fraction, approx. = 2/3, of these ions will reflect as molecules, and of this population a fraction as large as twenty percent will have vibrational excitation of v'' greater than or equal to 6. This large vibrational population will provide a contribution to the total excited level distribution that is comparable to the E-V process. Implications for negative ion generation in an optimized tandem configuration are discussed.

Physical Description

Pages: 9

Notes

NTIS, PC A02/MF A01.

Source

  • 3. international symposium on the production and neutralization of negative ions and beams, Upton, NY, USA, 14 Nov 1983

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  • Other: DE84003021
  • Report No.: UCRL-89993
  • Report No.: CONF-831180-3
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5667534
  • Archival Resource Key: ark:/67531/metadc1093661

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 11, 1983

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 27, 2018, 1 p.m.

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Hiskes, J.R. & Karo, A.M. Generation of vibrationally excited H/sub 2/ molecules by H/sub 2//sup +/ wall collisions, article, November 11, 1983; [Livermore,] California. (digital.library.unt.edu/ark:/67531/metadc1093661/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.