Abstract
Modeling of laser-excited optogalvanic effect for a mixture system of metal and rare-gas atoms is described, using rate equations in a modified Schottky formalism. The results are compared with the experimental results with a sodium discharge tube filled by Ar, Ne of He. Observed change of sign of the optogalvanic signal with the buffer gas pressure can be explained in terms of the variation of the electron temperature and the electron density. The relative amplitude of the measured signal is in good agreement with the numerical calculation for variation of the sodium density, the buffer gas pressure, the laser intensity, and the discharge current.
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