Abstract
Ionization phenomena in a spatilly isolated neutral gas clod interacting with a gun-produced plasma stream was studied using an optical spectrometer, a Kerr cell camera and an image converter camera. Helium gas cloud is ionized by hydrogen or helium plasma stream, but not ionized by nitrogen or argon plasma stream. It is revealed that a neutral gas cloud is ionized by electrons heated in a shock wave created in the mutual gas cloud-plasma stream interaction. Observing H in the interaction of hydrogen plasma stream with various gas clouds, the intensity of H is the strongest when hydrogen plasma stream interacts with helium gas cloud. This is explained by excitation transfer.
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