Dissociation Energies of Carbon Monoxide and Nitrogen from Reflected Shock Wave Studies

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Abstract
Reflected shock velocities have been measured in pure nitrogen, pure carbon monoxide, dilute mixtures of these gases in argon, and in pure argon. The results agree well with the calculations based on the dissociation energies, D(N2) = 9.76 ev and D(CO) = 11.1 ev; but not with D(N2) = 7.38 ev and D(CO) = 9.14 ev. An acceleration of the reflected shock in nitrogen and carbon monoxide is attributed to vibrational relaxation in the incident shock. Although some deviations from ideal behavior due to energy and momentum losses are shown to be present, the results indicate that equilibrium is very nearly attained, and that shock tube measurements can provide useful high‐temperature thermodynamic information.

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