Accession Number : ADA189618

Title :   An Experimental and Theoretical Investigation of Optogalvanic Effects.

Descriptive Note : Final rept. 21 Aug 84-20 Aug 87,

Corporate Author : WISCONSIN UNIV-MADISON DEPT OF PHYSICS

Personal Author(s) : Lawler, J E

PDF Url : ADA189618

Report Date : Dec 1987

Pagination or Media Count : 86

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.

Descriptors :   *GLOW DISCHARGES, *ELECTROOPTICS, *COLD CATHODE TUBES, BALANCE, CATHODES, DIAGNOSIS(GENERAL), ELECTRON ENERGY, ELECTRON GAS, GASES, IONIZATION, LOW ENERGY, METASTABLE STATE, MONTE CARLO METHOD, PRODUCTION RATE, RATES, SIMULATION, SURFACES, TEMPERATURE, HELIUM, CURRENT DENSITY, LASER APPLICATIONS

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE