In-situ density and temperature measurements of vibrationally-excited hydrogen molecules in ion source plasmas

Conference · Thu Jun 01 04:00:00 EDT 1989

OSTI ID:5921756

Stutzin, G C; Young, A T; Doebele, H F; Schlachter, A S; Leung, K N; Kunkel, W B

The role of highly vibrationally-excited hydrogen molecules has been postulated to be of great importance in H/sup /minus// ion sources. However the difficulty of making in-situ measurements has led to a paucity of direct determinations of these species within the plasma of these sources. Recently, vacuum-ultraviolet (VUV) laser absorption spectroscopy has been used to measure the H/sub 2/ rovibrational populations up to v/prime//prime/ = 5 and J/prime//prime/ = 8 in a medium-power hydrogen plasma. This work extends those measurements to v/prime//prime/ = 8 and to J/prime//prime/ = 13. The populations of the vibrational levels still appear to be almost Boltzmann. The theoretically predicted plateau is not observed up to the detection limit. The dependence of several vibrational levels on discharge current and filling pressure is shown. 15 refs., 4 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5921756
• Report Number(s): LBL-26795; CONF-890703-15; ON: DE89016315
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
CHARGED PARTICLES
ENERGY LEVELS
EXCITED STATES
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION SOURCES
IONS
LASER SPECTROSCOPY
MOLECULES
PRESSURE MEASUREMENT
ROTATIONAL STATES
SPECTROSCOPY
TEMPERATURE MEASUREMENT
VIBRATIONAL STATES