Vibration Temperature in relation to Rotation Temperature in Band Spectra

Abstract

THE problem of exciting band spectra of two different molecules in the same source has attracted some attention of late. Investigation of excitation temperatures of molecules under these conditions has given interesting results which require elucidation from theory. For example, Lochte-Holtgreven¹ found by examining CH and C₂ bands in the same discharge tube a temperature difference of more than 1,000° between the two. On the other hand, van Wijk² arrived at a common effective temperature from the negative (N⁺₂) and second positive (N₂) bands of nitrogen in the same discharge tube. In view of these results, it was deemed necessary to undertake further work on the same lines.