Experimental study on the ionization of argon behind reflected shock waves

The electron temperature and density along with the ion temperature in argon gas behind reflected shock waves were measured by laser light scattering, while the spectroscopic temperature was measured from the ArI line emissions. The values of these three temperatures are different from each other fo...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1983-01, Vol.22 (4), p.735-741
Main Authors: TERAO, K, HOZAKA, M, KAITOH, H
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma diagnostic techniques and instrumentation
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Summary:The electron temperature and density along with the ion temperature in argon gas behind reflected shock waves were measured by laser light scattering, while the spectroscopic temperature was measured from the ArI line emissions. The values of these three temperatures are different from each other for a few hundred microseconds after arrival of the reflected shock front. Both the electron and ion temperatures are much higher than the theoretical gasdynamic temperature, while the spectroscopic temperature is lower than the theoretical one. The degree of ionization is much higher than that in the equilibrium state. The stochastic character of the ArI line emissions was observed, indicating that the gas is inhomogeneous. These phenomena are explained as follows: initially, the gas behind the reflected shock wave is inhomogeneous, and an associative ionization is initiated at some points. The gas becomes homogeneous mainly through diffusion.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.22.735