Influence of cathode material on generation of energetic hydrogen atoms in a glow discharge
- Faculty of Transport and Traffic Engineering, University of Belgrade, Vojvode Stepe 305, Belgrade 11000 (Serbia)
- Faculty of Physics, University of Belgrade, P.O. Box 368, Belgrade 11000 (Serbia)
In this paper influence of cathode material on formation of fast hydrogen atoms in an abnormal glow discharge is investigated using Balmer alpha emission spectroscopy. Energetic H atoms are generated in charge exchange reactions of hydrogen ions that are accelerated in the electric field, and also formed in the backscattering process at the cathode surface. Copper and graphite cathodes were used. Investigation was performed in two orthogonal directions of observation in pure hydrogen and argon-hydrogen mixture. The shapes of the profiles are examined together with the space intensity distribution of Balmer alpha line. Reduced atom reflection from graphite was manifested in the spectroscopic result, in accordance to the field acceleration model. The effect was evident only at high ion energies. This is explained by energy dependence of reflection coefficient for H atoms.
- OSTI ID:
- 21538011
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 109; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARGON
ATOMS
BACKSCATTERING
CARBON
CATHODES
CHARGE EXCHANGE
CHARGE-EXCHANGE REACTIONS
CHARGED PARTICLES
COPPER
DISPERSIONS
DISTRIBUTION
ELECTRIC DISCHARGES
ELECTRIC FIELDS
ELECTRODES
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY DEPENDENCE
FLUIDS
GASES
GLOW DISCHARGES
GRAPHITE
HYDROGEN
HYDROGEN IONS
IONS
METALS
MINERALS
MIXTURES
NONMETALS
NUCLEAR REACTIONS
PLASMA
PLASMA DIAGNOSTICS
RARE GASES
REFLECTION
SCATTERING
SPECTROSCOPY
SURFACES
TRANSITION ELEMENTS