Abstract
The ionization kinetics of sodium diluted in argon is studied in a shocktube, in which the test gas mixture is ionized by a reflected shock waveand subsequently quenched by a strong rarefaction wave. A Langmuirelectrostatic probe is used to monitor the variation of the ion numberdensity at the reflection shock wave region. The working state of theprobe is in the near free fall region and a correction for reduction ofthe probe current due to elastic scattering in the probe sheath isintroduced. At the temperature range of 800 to 2600 K and in the ambience ofargon gas, the three-body recombination rate coefficient of the sodium ionwith electron is determined: 3.43×10-14T-3.77cm6·s-1.
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