Study of the 15N14N18O absorption bands in the 4200–6500 cm−1 region.

Five bands of ¹⁵N¹⁴N¹⁸O nitrous oxide isotopologue were detected in the 4200–6500 cm⁻¹ region with a Bruker IFS-125M Fourier transform spectrometer using a sample composed of NO (80% of ¹⁵N¹⁸O and 20% of ¹⁴N¹⁶O) and a trace amount of N₂O isotopologues. The line positions of these bands were measured to the uncertainties of 0.001 cm⁻¹. The spectroscopic constants were fitted using the measured line positions. The root mean squares of the residuals (RMS) of the fits (0.0005 cm⁻¹ 0.0027 cm⁻¹) were close to the experimental uncertainties. Four bands, ν 1 + 2 ν 2 0 + ν 3 , 4 ν 1 , 2 ν 1 + 2 ν 2 0 + ν 3 , and ν 2 1 + 2 ν 3 − ν 2 1 , were observed for the first time. The line positions of the 2ν₃ band were determined with a smaller uncertainty than in (A. W. Mantz, K. Narahari Rao, L.H. Jones, R.M. Potter. J. Mol. Spectrosc. 30, 513 (1969)). [ABSTRACT FROM AUTHOR]