Spectroscopic study of the afterglow excited by intense electrical discharges in high-pressure helium hydrogen mixtures
In this work, we report the study of afterglow plasmas with initial electron density over 10/sup 15/ cm/sup -3/ excited by repetitive 3 kA, 7 ns duration discharges in He--H/sub 2/ mixtures with helium pressure in the range 310--760 Torr and partial pressure of hydrogen from 20 to 400 mTorr. The afterglow radiation was emitted in He/sub 2/ transitions as well as in atomic hydrogen spectral lines, with L..cap alpha.. being particularly intense. The ground state H concentration was estimated from the profile of the self-absorbed L..cap alpha.. line, indicating that dissociation of hydrogen occurs mainly in the afterglow by electron--ion recombination. He (2 /sup 3/S) destruction frequencies have been determined from measurements of the optical absorption of the 2 /sup 3/S..-->..3 /sup 3/P helium transition and were analyzed in terms of rate coefficients for various quenching processes. Among these, the Penning reaction with atomic hydrogen was found to be important.
- Research Organization:
- G.R.E.M.I., Universite d'Orleans, 45046 Orleans Cedex, France
- OSTI ID:
- 5604754
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 83:3; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AFTERGLOW
DIMERS
DISPERSIONS
ELECTRIC DISCHARGES
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
FLUIDS
GASES
HELIUM
HIGH PRESSURE
HYDROGEN
LYMAN LINES
MIXTURES
NONMETALS
RARE GASES
SPECTRA