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Spectrum of the 15N17O isotopologue in the region of 1.86 μm. Determination of the "Dunham-type" constants
Russian version
Borkov Yu.G. 1, Sulakshina O.N. 1, Serdyukov V. I. 1, Sinitsa L. N. 1
1V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences,Tomsk, Russia
Email: geo@iao.ru, son@iao.ru, svi@iao.ru, sln@iao.ru
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The absorption spectrum of the 15N17O molecule in the range 5200-5500 cm-1 was recorded for the first time using a Bruker IFS-125M Fourier spectrometer with a spectral resolution of 0.0056 cm-1. Analysis of the spectrum made it possible to detect the vibration-rotation lines of the 3-0 band of the main transitions in the X2 electronic state of the 15N17O molecule. For the main transitions 21/2- 21/2 and 23/2-23/2, 149 positions of rotational lines were registered in the three branches with the maximum value of the rotational quantum number J=29.5. It was for the first time possible to determine the parameters of -splitting in this band. The positions and relative intensities of both the components of the -doublets and the centers of 31 unresolved doublets were determined. The frequencies of the registered transitions and the transition frequencies in the 1-0 vibrational band, weighted in accordance with experimental uncertainties, were jointly processed using two models. As a result of the processing, spectroscopic parameters were determined for vibrational states v=0,1,3, as well as "Dunham-type" constants for the 15N17O isotopologue. Using the found "Dunham-type" constants, model calculations of transition frequencies in vibrational bands 1-0, 2-0, 3-0 up to J=35.5 were performed. A comparison of the calculated transition frequencies with those given in the Exomol project was made. Keywords: 15N17O isotopologue, experimental spectrum, vibration band 3-0, spectroscopic constants, "Dunham-type" constants.
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