Abstract
The limitations and inherent precision of shock tube spectroscopy is discussed in relation to the measurement of molecular transition probabilities. The techniques used in measurements on the O 2 Schumann-Runge and the N 2 first positive band systems are presented, and the errors in the results are discussed. Finally, the i.r. spectrum of air is shown, and evidence is presented which indicates that the radiation results from transitions between excited electronic states in the NO produced in shock-heated air. The need for the positive identification of radiating species is stressed, and the examples were chosen to illustrate the various techniques used to achieve such identification, upon which the quantitative aspect of shock tube spectroscopy must be based.
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