Abstract
Measured room temperature nitrogen-broadening coefficients are given for about 60 Λ-doublets belonging to the allowed sub-bands of the first overtone of nitric oxide, between 3620 and 3790 cm −1. Whereas a slight differential broadening (3.2% on the average) is observed between the two sub-bands, no significant vibrational dependence appears when one compares these values with those available for the fundamental band. Combining the N 2-broadening coefficients with the O 2-broadening coefficients recently published, the air-broadening required for atmospheric applications appears to be lower than the N 2-broadening by 2%.
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