Abstract

The relative intensities of the band heads in the Δv=0, +1, and −1 sequences of the B2∑−X2∑ violet bands of CN have been measured in low-dispersion emission spectra excited in a graphite-tube electric furnace. In the furnace the CN radicals are in thermal equilibrium at a known temperature so that their distribution among the vibrational and rotational energy levels can be calculated. This permits relative vibrational transition probabilities to be derived from the measured intensities of the band heads. Various factors which affect the observed intensities were investigated and corrections for them obtained. These factors include the variations in rotational line structure comprising the band heads, the effect of overlapping rotational lines of neighboring bands, and the effects of self-reversal and self-absorption. The vibrational transition probabilities obtained are compared with theoretical data calculated by different methods.

© 1955 Optical Society of America

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