Abstract
Summary form only given, as follows. Modeling of discharge light sources is becoming increasingly important in predicting device performance and determination of optimal regimes for their operation. A good knowledge of the elementary processes occurring under non-equilibrium conditions is a prerequisite for any model. Chemi-ionization processes involving collisions of excited atoms play a crucial role in many lighting discharges, both for low (a few torr) and higher (>10 torr) gas pressures. The understanding of such processes and their role in discharge power balance is scant, and quantitative data on the rate coefficients is inadequate. Experimental studies of chemi-ionization in collisions of metastable neon and mercury atoms were recently initiated at Brooklyn Polytechnic University. Rate coefficients for collisions between two p/sup 5/3s/sup 13/P/sub 2/ and between 2p/sup 5/3s/sup 13/P/sub 2/ and /sup 3/P/sub 1/ excited neon atoms were measured using plasma electron spectroscopy. Investigation of chemi-ionization in collisions of 6/sup 3/P/sub 0,1,2/ mercury states is under way and the intermediate results will be reported.
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