Abstract
The effect of irradiation from an incandescent light source on the average current of a discharge in argon (the Joshi effect) was studied for pressures of 0.7 to 10 torr using a cylindrical glass vessel (length 1.2 cm, diameter 5.3 cm) and applying an a.c. voltage (of frequency 20-500 Hz) to external electrodes. The first current pulse group in each half cycle was found to consist of a steady wide low pulse which appears at a constant phase angle and a flickering narrow high pulse erratic in phase angle. Irradiation with a 200 W lamp placed 30 cm from the vessel reduces the amplitude of the second pulse considerably. By increasing the applied voltage beyond threshold the relative change in average current Delta I/I was found to increase continuously whereas other workers have always observed a decrease in Delta I/I with rising V.
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