The role of high Rydberg states in the generation of negative ions in negative-ion discharges

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The generation of substantial yields of H{sup {minus}} ions in a laser excited H{sub 2} gas has been reported by Pinnaduwage and Christoforu. These H{sup {minus}} yields have been attributed to (2 + 1) REMP photoexcitation processes leading to dissociative attachment of doubly-excited or superexcited states (SES), or dissociative attachment of high Rydberg product states. The new feature of these experiments is the implied large dissociative attachment rates, of order 10{sup {minus}6} cm{sup 3} sec{sup {minus}1}, values that are orders-of-magnitude larger than the dissociative attachment of the vibrationally excited levels of the ground electronic state. While these laser excitations are ... continued below

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14 p.

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Hiskes, J.R. November 28, 1995.

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Description

The generation of substantial yields of H{sup {minus}} ions in a laser excited H{sub 2} gas has been reported by Pinnaduwage and Christoforu. These H{sup {minus}} yields have been attributed to (2 + 1) REMP photoexcitation processes leading to dissociative attachment of doubly-excited or superexcited states (SES), or dissociative attachment of high Rydberg product states. The new feature of these experiments is the implied large dissociative attachment rates, of order 10{sup {minus}6} cm{sup 3} sec{sup {minus}1}, values that are orders-of-magnitude larger than the dissociative attachment of the vibrationally excited levels of the ground electronic state. While these laser excitations are not directly applicable to a hydrogen negative-ion discharge, the implication of large dissociative attachment rates to the high Rydberg states may affect both the total negative-ion density and the interpretation of discharge performance. Within the discharge energetic electrons will collisionally excite the higher Rydberg states, and the relative contribution of the dissociative attachment of these states when compared with the dissociative attachment to the ground state vibrational levels, is the topic of this paper.

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14 p.

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INIS; OSTI as DE96005313

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  • Joint meeting of the 7. international symposium on the production and neutralization of negative ions and beams and the 6. European workshop on the production and application of light negative ions, Upton, NY (United States), 23-27 Oct 1995

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  • Other: DE96005313
  • Report No.: UCRL-JC--122525
  • Report No.: CONF-9510304--2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 201795
  • Archival Resource Key: ark:/67531/metadc664329

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  • November 28, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 23, 2016, 12:06 p.m.

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Hiskes, J.R. The role of high Rydberg states in the generation of negative ions in negative-ion discharges, article, November 28, 1995; California. (digital.library.unt.edu/ark:/67531/metadc664329/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.