Abstract
An argon discharge at high pressure (up to 20 atmosph.) and large dc current is described. This discharge is used in the investigation of spontaneous fluctuations of photon radiation. Electron and ion densities are calculated as functions of pressure and temperature from which the continuous emission and absorption coefficients are determined. By comparing the calculated emission with the measured distribution of the infrared spectral radiation intensity in a disk of plasma, which is 0,2 mm in front of the cathode, the radial temperature distribution in the disk is determined. The temperature in the arc axis was found to be independent of the gas pressure and must be higher than 28 000°K. Investigations on electrical conductivity confirm the temperature distributions. Finally, the statistical radiation fluctuations can be calculated by means of the equations given in Part I and are compared with the experimental results. The infrared detector used for all these measurements is also described in Part I. A satisfactory coincidence between calculated and measured values was found.
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