In the preceding paper, design of three different types of generators for plasma jet was given; they were stabilized by running water, argon and nitrogen gas, respectively. Their electrical characteristics were measured under various conditions of plasma pinch.
In the present work, some information on the temperatures of the plasma jet and the plasma column squeezed by the so-called thermal pinch effect between both electrodes are obtained by spectroscopic means.
The temperature of the plasma jet stabilized by water is measured by means of the Stark broadening of Hβ line and the intensity distribution of rotational lines in OH (0, 0) band spectrum.
The temperature of the argon plasma column is calculated with the aid of the relative intensity distribution of A I and All spectral lines. In this method it is necessary to know the densities of ions; theoretically, they are obtained from the Saha equation or from the formula for corona.
In our experiment, the latter seemed appropriate rather than the former. In addition, the velocity distribution of electrons deviated considerably from the Maxwell distribution, especially in high energy region, which is considered attributable to the temperature gradient existing in the plasma column.
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