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

Conference · Wed Feb 29 23:00:00 EST 1984 · AIP Conf. Proc.; (United States)

OSTI ID:5798374

Hiskes, J R; Karo, A M

The H/sup +//sub 2/ 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/sup +//sub 2/ 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 v'' > or = 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.

• Research Organization: Lawrence Livermore National Laboratory, Livermore, California 94550
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5798374
• Report Number(s): CONF-831180-
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 111:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AUGER EFFECT
BEAM NEUTRALIZATION
BEAM PRODUCTION
CATIONS
CHARGED PARTICLES
COLLISIONS
ELECTRIC DISCHARGES
ELEMENTS
ENERGY
ENERGY LEVELS
EXCITED STATES
GROUND STATES
HYDROGEN
HYDROGEN IONS
IONS
KINETIC ENERGY
MOLECULAR IONS
MOLECULES
NONMETALS
RELAXATION
VIBRATIONAL STATES
WALLS