Spectroscopic parameters of the (3-0) vibrational band for the 15N16O molecule in the ground electronic state
Yu.G. Borkov, O.N. Sulakshina, V.I. Serdyukov, L.N. Sinitsa
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: NO isotopologue, registered spectrum, vibration band 3-0, spectroscopic constants
Abstract
The spectrum of the 15N16O molecule in the region 5200-5500 сm-1 is recorded and analyzed. As a result of the analysis, 150 Λ-doublets of vibration-rotational lines are found in the 3-0 band of the main transitions between the 2Π1/2 and 2Π3/2 electronic states. For 108 of them, when the splitting value was greater than 4.5 × 10-13 сm-1, it was possible to obtain the positions and relative intensities of each component of the doublet, while the self-expansion parameter was fixed to the value from HITRAN2020, and the intensities of the components e and f were considered equal. The maximum of the rotational quantum number J was 30.5. The frequencies of the transitions recorded, weighted in accordance with the experimental uncertainties, were processed by the program code using the non-linear least squares method. As a result of processing, the spectroscopic constants for the v = 3 vibrational state of the 15N16O isotopologue are found. The Λ-doubling constants for this state are determined for the first time. The results are compared with the well-known database of spectroscopic information HITRAN2020.
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