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The optogalvanic effect in a neon Townsend discharge

The optogalvanic effect for the 1s5-2p2 transition (Paschen notation) in a low current (0.5 mu A) neon Townsend discharge has been studied for three pressures (1, 4 and 10 Torr). The optogalvanic effect occurs by irradiating the discharge with an expanded laser beam, in a variable plane parallel to the electrodes. By moving the discharge tube perpendicular to the electrodes and by using a dye laser with a continuously adjustable frequency, measurements of the optogalvanic effect could be carried out for a number of irradiation positions as a function of the laser frequency. In calculating the optogalvanic effect, secondary ionization processes are dominant and therefore one needs to know the probabilities that resonant photons and metastables produced in the discharge reach the cathode. The first probability has been calculated using Monte Carlo simulation methods, with the method developed by Lee to calculate the frequency redistribution of a resonant photon after the interaction with an atom. The second probability has been found by solving the transport equation of the metastables. The optogalvanic effect measurements agree to first order with the theoretical calculations.