Michel L, Fischer H
Appl Opt. 1972 Apr 1;11(4):899-906. doi: 10.1364/AO.11.000899.
The spectral radiant intensity (without imaging) is observed between 5000 A and 1250 A with gas pressures 1-8 atm in argon and 10-40 atm in helium. Tungsten and carbon electrodes with 1-mm gaps were used at breakdown voltages of 1.5-6.5 kV and C = 0.85 microF and L = 16.8 nHy. After reaching opacity and saturation within the visible range, the continuum radiation shifts toward shorter wavelengths with increasing voltage and gas pressure and reaches the intensity of the broad A(+), A(++), and He(+) lines. Saturation of spectral intensity and self-reversal of lines is observed; intensities at 1250 A may be higher by a factor of 25 than those at 5000 A. Mean gas temperatures of approximately 60,000 K in argon and 100,000 K in helium are determined from the spectral lines of the electrode vapor in the case of relatively low gas pressures and foremost transparent channels by means of the Norm-temperature method. Channel pressures and particle densities are ca culated from the channel expansion. Theoretical values of the continuum radiant intensity agree with the experimental results reasonably well.
在氩气气压为1 - 8个大气压、氦气气压为10 - 40个大气压的条件下，在5000埃至1250埃之间观测（无成像）光谱辐射强度。在1.5 - 6.5千伏的击穿电压、电容C = 0.85微法和电感L = 16.8纳亨的条件下，使用了间隙为1毫米的钨电极和碳电极。在可见光范围内达到不透明度和饱和状态后，连续辐射随着电压和气压的增加向更短波长移动，并达到宽A(+)、A(++)和He(+)线的强度。观测到光谱强度的饱和以及谱线的自反转；1250埃处的强度可能比5000埃处的强度高25倍。在相对较低的气压和主要为透明通道的情况下，通过常温法根据电极蒸气的光谱线确定氩气中的平均气体温度约为60000开尔文，氦气中的平均气体温度约为100000开尔文。根据通道膨胀计算通道压力和粒子密度。连续辐射强度的理论值与实验结果相当吻合。
