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On the population of the metastable states behind unstable shock waves in ionizing argon

Published online by Cambridge University Press:  21 April 2006

A. F. P. Houwing ,
T. J. Mcintyre ,
P. A. Taloni  and
R. J. Sandeman
A. F. P. Houwing
Affiliation:
Department of Physics and Theoretical Physics, Australian National University, Canberra, Australia
T. J. Mcintyre
Affiliation:
Department of Physics and Theoretical Physics, Australian National University, Canberra, Australia
P. A. Taloni
Affiliation:
Department of Physics and Theoretical Physics, Australian National University, Canberra, Australia
R. J. Sandeman
Affiliation:
Department of Physics and Theoretical Physics, Australian National University, Canberra, Australia
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Abstract

Experiments are described in which the populations of metastable levels in ionizing argon are measured through spatially resolved hook interferometry. The results are compared with the present model for shock-induced ionization and a recently proposed mechanism to explain observed flow instabilities. It is found that the experimental measurements support the presently accepted model, which states that electron–atom collisions play the dominant role in the excitation process, but contradicts recent proposals which predict a rapid build-up of anomalously high metastable populations through atom–atom collisions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 170 , September 1986 , pp. 319 - 337
Copyright
© 1986 Cambridge University Press

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