Physics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..gec.mpd18s&link_type=abstract
American Physical Society, Gaseous Electronics Conference, October 21-24, 1996, abstract #MPD.18
Physics
Scientific paper
Electric discharge plasmas generally exhibit a negative V-I (voltage-current) characteristic and hence require a ballast for stable operation on ordinary voltage sources. However, there are instances in the literature of positive V-I characteristics in the positive column itself which cannot be attributed to the usual suspects: electrode phenomena, species segregation, high ionization fraction, and so on. An explanation for positive voltage-current characteristics (PVICs) seen in low-pressure argon-mercury discharges has been constructed using both a comprehensive model(T. J. Sommerer, J. Phys. D 29), 769 (1996). and simplified rate equation models, along with various published and unpublished data. The cause of the PVIC is electron-impact ``conversion'' of metastable mercury atoms into resonance-level atoms, a process which interferes with the dominant ionization mechanism over discharge current densities 0.1--10 mA/cm^2.
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