The shock tube as a source for studies of emission and absorption spectra

Clouston, J. G.; Gaydon, A. G.

doi:10.1016/0371-1951(59)80217-4

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Several studies (Harwell & Jahn 1964;Morgan & Morrison 1965;Hill & Capp 1965;Kelly 1966) have demonstrated that, for degrees of ionization less than 10-4, the mechanism of ionization is normally a multi-stage process in which the rate controlling step is the formation of an excited atom. The experimental evidence for this mechanism is th at the ionization rates show an activation energy equal to the energy of the excited state rather than the ionization potential.…”

Section: Interpretation Of Ion Signalsmentioning

confidence: 99%

Studies in expanded shock tube flows II. Interpretation of ion density profiles

Bradley

Robinson

1967

Proc. R. Soc. Lond. A

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Ion density profiles have been obtained in expanded shock tube flows from incident shock waves in argon and in air. The rate of increase of ion density and the ‘plateau’ level of ion density have been measured for shock waves in argon over the temperature range, 3670 to 10730°K, and in air over the range 2260 to 3790°K. The Arrhenius temperature coefficients obtained are much smaller than the ionization potentials of the major species involved and the results are interpreted in terms of a multi-step process involving impurity ionization. The changes in the physical properties associated with the flow through the expansion and their effect on the ‘freezing’ condition are also discussed. Evidence is also presented for vibrational equilibration during the expansion process.

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Section: Interpretation Of Ion Signalsmentioning

confidence: 99%

Studies in expanded shock tube flows II. Interpretation of ion density profiles

Bradley

Robinson

1967

Proc. R. Soc. Lond. A

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“…There is no single opinion as to which atom or molecule makes the main contribution to the luminescence of the shock wave front. In [93] the opinion is stated that the luminescence peak in the forward shock wave in argon in the presence of small impurities of carbon dioxide is due to the C 2 molecule. In certain of our experiments this peak was obtained in the forward shock wave even when Swan bands were not observed behind the reflected shock wave, and only sodium D-lines appeared on the spectrogram.…”

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confidence: 99%