N_2O vibration–rotation parameters derived from measurements in the 900–1090-and 1580–2380-cm^−1 regions

Abstract

The N2O infrared spectrum in the 900–1090- and 1580–2380-cm−1 regions was studied at a 0.005-cm−1 resolution with a Fourier-transform spectrometer. Measurements were made of line frequencies of the species 14N216O, 14N15N16O, 15N14N16O, 14N218O, 14N217O, 15N216O, 14N15N18O, and 15N14N18O for several ground-state bands and hot bands. A few of these bands are reported for the first time to the author’s knowledge. The observed line frequencies were analyzed to obtain values of band centers and upper-state effective rotational constants. Results from the least-squares fits for the 0400–0000, 0420(e)–0000, and 0510–0110 bands of the 14N216O molecule indicate that the high-J levels of the upper states are perturbed. Resonance interactions were observed in transitions in the 1001–1000 band of 14N216O and 15N14N16O and the 1111(f)–1110(f), 0600–0200, 0600–1000, and 0620(e)–1000 bands of 14N216O.