Analysis of 14N18O Spectrum in the 5200-5500 сm-1 Spectral Region

The absorption spectrum of (NO)-N-14-O-18 molecule in the 5200-5500 & scy;m(-1) region was recorded for the first time using a Bruker IFS 125M Fourier spectrometer with a spectral resolution of 0.0056 & scy;m(-1). The analysis of the spectrum made it possible to detect the vibrational-rotational lines of the 3-0 band of the main transitions in the X211 electronic state of the (NO)-N-14-O-18 molecule. For the main (2)Pi(1/2)-(2)Pi(1/2) and (2)Pi(3/2)-(2)Pi(3/2) transitions, positions of 102 lines from a A-doublet were recorded in three branches. The positions and relative intensities of each component of the doublet were determined for 61 resolved doublets. The maximal rotational quantum number Jwas 29.5. The experimental line positions in the 3-0 band confirm the calculated data presented in HITRAN database. The frequencies of recorded transitions, weighted in accordance with experimental uncertainties, were processed, and the spectroscopic constants were determined for the vibrational state v = 3. With the found spectroscopic constants, we predicted the rotational energy values up to J = 35.5 for the vibrational state v = 3 and transition frequencies in the 3-3 and 3-0 vibrational bands for the (2)Pi(1/2) and (2)Pi(3/2) electronic states. The calculation results agree with the data given in HITRAN within the error specified in this database.