High-resolution infrared spectrum of the ν3 and ν2 + ν3 − ν2 bands of 14N 16O 2

Abstract

The infrared absorption spectrum of the ν 3 band of 14NO 2 has been recorded with a resolution and a frequency accuracy much improved over the previous investigations. The K- and N-line assignments have been greatly extended and a more accurate set of spectroscopic constants derived. Several lines in the subbands with K a ≥ 3 have been observed to be doubled by spin-rotation interaction and spin-rotation interaction constants have been obtained. Several weak series of lines in the spectrum ( K a = 0, 1, 2, and 3) have been unambiguously assigned to the “hot band” ν 2 + ν 3 − ν 2. Lines of the K a = 3, 4, 5, and 6 sub-bands of ν 3 have been found to be perturbed by a Coriolis interaction with the K a = 4, 5, 6, and 7 levels of 2 ν 2.