Analysis of 14N18O spectrum in the 5200-5500 сm-1 infrared spectral region
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, experimental spectrum, vibration band 3-0, transition frequency, relative intensity, spectroscopic constant
Abstract
The absorption spectrum of 14N18O molecule in the 5200-5500 сm-1 range was recorded for the first time using a Bruker IFS 125M Fourier spectrometer with a spectral resolution of 0.0056 сm-1. The analysis of the spectrum made it possible to detect the vibrational-rotational lines of 3-0 band of the main transitions in X2Π electronic state of 14N18O molecule. For the main transitions 2Π1/2 - 2Π1/2 and 2Π3/2 - 2Π3/2, 102 line positions of Λ-doublet in three branches were registered. For 61 resolved doublets, the positions and relative intensities of each component of a doublet were determined. The maximum value of the rotational quantum number J was 29.5. The found experimental line positions in 3-0 band confirmed the calculated data given in HITRAN database. The frequencies of registered transitions, weighted in accordance with experimental uncertainties, have been processed, and the spectroscopic constants for the vibrational state v = 3 been determined. With the found spectroscopic constants, we predicted the rotational energy values up to J = 35.5 for the vibrational state v = 3 and, accordingly, the transition frequencies in 3-3 and 3-0 vibrational bands for 2Π1/2 and 2Π3/2 electronic states. The calculations performed showed agreement with the data given in HITRAN within the error specified in this database.
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