Measurement of atomic and molecular hydrogen in a tandem magnetic multicusp H sup minus ion source by VUV spectroscopy

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1142842· OSTI ID:7068499

Young, A T; Stutzin, G C; Chen, P; Kunkel, W B; Leung, K N ^[1]

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1. Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

The populations of ground electronic state atomic hydrogen and ground electronic state, vibrationally--rotationally excited hydrogen molecule in a negative hydrogen ion source discharge have been measured using vacuum ultraviolet (VUV) laser absorption spectroscopy. These populations have been measured under a variety of discharge conditions in two different regions of a tandem chamber ion source. Preliminary results of the measurements in the driver region and filter region are given. It is observed that the atomic hydrogen density decreases as one goes from the driver to the filter region. This indicates that the surfaces directly adjacent to the filter region are net sinks for hydrogen atoms. In contrast, the molecular vibrational population distribution shows only a small difference between the two regions, indicating that these surfaces are not net sinks for the excited molecules.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7068499
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:4; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
ANIONS
ATOMS
CHARGED PARTICLES
ELECTRON DENSITY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXTREME ULTRAVIOLET SPECTRA
GROUND STATES
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION SOURCES
IONS
LAWRENCE LIVERMORE LABORATORY
MOLECULES
NATIONAL ORGANIZATIONS
NEUTRAL BEAM SOURCES
NONMETALS
SPECTRA
ULTRAVIOLET SPECTRA
US AEC
US DOE
US ERDA
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