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Proceedings Paper

Laser-Based Detection Of Highly Vibrationally Excited H[sub]2[/sub] For Plasma Diagnostics
Author(s): Daniel C. Robie; L. E. Jusinski; William K. Bischel
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Paper Abstract

It has been suggested that the main source of IV in hydrogen plasmas is dissociative attachment to H2(v≥4). In order to test models that include this process, it is necessary to measure the populations of the relevant vibrational levels inside the plasma. We have constructed a source of vibrationally excited H2 using a recently discovered hot-wire effect. Using 2+1 resonantly enhanced multiphoton ionization (REMPI) through the EF state, we have detected H2 in 27 bands from X(v"=4-11) to EF(v'=0-14). Rotational temperatures appear to be 300-800 K, well below that required for thermal excitation of the observed vibrational levels. The population of vibrational levels appears to fall off dramatically between v"=9 and 10.

Paper Details

Date Published: 25 July 1989
PDF: 4 pages
Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989); doi: 10.1117/12.951849
Show Author Affiliations
Daniel C. Robie, SRI International (United States)
L. E. Jusinski, SRI International (United States)
William K. Bischel, SRI International (United States)

Published in SPIE Proceedings Vol. 1061:
Microwave and Particle Beam Sources and Directed Energy Concepts
Howard E. Brandt, Editor(s)

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