Nonmonotonic radial distribution of excited atoms in a positive column of pulsed direct currect discharges in helium
- Sandia National Laboratories, Albuquerque, New Mexico 87185-1423 (United States)
- CFD Research Corporation, Huntsville, Alabama 35805 (United States)
Nonmonotonic radial distributions of excited helium atoms have been experimentally observed in a positive column of pulsed helium discharges using planar laser induced fluorescence. Computational analysis of the discharge dynamics with a fluid plasma model confirms the experimental observations over a range of pressures and currents. The observed effect is attributed to the peculiarities of electron population-depopulation of the excited states during the 'dynamic discharge' conditions with strong modulations of the electric field maintaining the plasma.
- OSTI ID:
- 22162687
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 102; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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