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The ionization of shock heated argon was measured by means of the attenuation and phase shift of transmitted microwaves of 2.5 and 8 mm at shock Mach numbers 7.5 ≦ Ms ≦ 11.8 and initial pressures 3 ≦ p 1 /Torr ≦ 20. Taking into account the boundary layer at the shock tube wall it is possible to evaluate the plasma density and electron collision frequency from specially prepared attenuation-phase angle-diagrams. A pulsed Langmuir probe has been tested regarding its feasibility to measure the plasma density and the electron temperature. The reaction rate equations of Jahn and Harwell including the ionization of impurities have been solved in order to interpret the plasma density profiles. The theoretically required reaction rates for the ionization of argon by an excitation process, k* and k 1  + , and for ionization by collisions between electrons and argon atoms, k 3  + , have been experimentally determined.

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Ionisationsmessung hinter Stoßwellen in Argon mittels Mikrowellen und einer gepulsten Langmuir-Sonde / Ionization Measurements behind Shocks in Argon with Microwaves and a Pulsed Langmuir Probe