An Experimental and Theoretical Investigation of Optogalvanic Effects.
Abstract
Various laser diagnostics are used to study the cathode fall and negative glow regions of a He glow discharge with a cold Al cathode.The electric field and absolute metastable densities are mapped and the gas temperature is measured over a range of current densities from a near normal (173V) to a highly abnormal (600V) cathode fall. These measurements are analyzed to yield the current balance at the cathode surface, the ionization rate in the cathode fall region, and the metastable production rate in the cathode fall and negative glow regions. The experimental results compare favorably with the results of Monte Carlo simulations. The density and temperature of the low energy electron gas in the negative glow is determined by combining information from the experiments and Monte Carlo simulations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1987
- Accession Number
- ADA189618
Entities
People
- J. E. Lawler
Organizations
- University of Wisconsin Madison Department of Physics