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Ionization processes in helium at pressures near to atmospheric

J Dutton and D B Rees

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Determinations of primary α and secondary ω ionization coefficients in helium at pressures p0 near to atmospheric and low values of E/p0 (E is the electric field) show that α/p0 = f(E/p0) and ω/α = phi(E/p0) for 30 < p0d < 730 cm torr. The results obtained for ω/α and its dependence on E/p0 are shown to be adequately accounted for on the basis of the assumption that the predominant secondary ionization process in helium at high pressures is the destruction of metastable states in the gas with the consequent production of non-resonance photons which liberate secondary electrons at the cathode.

PACS

51.50.+v Electrical properties (ionization, breakdown, electron and ion mobility, etc.)

51.10.+y Kinetic and transport theory of gases

Subjects

Plasma physics

Dates

Issue 3 (March 1967)

Received 3 June 1966



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