New rotational analysis of the 010-010 and 000-010 bands in the A2Σ+ - X2Π electronic transition of the N2O+ molecule

In this work a new analysis of the 010-010 and 000-010 bands in the A(2)Sigma(+) - X-2 Pi electronic transition of the N2O+ molecule is performed by high resolution Fourier transform spectroscopy. Two sets of spectra of the N2O+ molecule at different temperatures are analysed, one at 30 K and the other at 340 K approximately, which made possible an unambiguous assignment of the spectral lines. Due to this fact and from a "natural" advantage of the Fourier transform spectroscopy since, being an interferential spectrometry, the obtained spectrum provides absolute wavenumbers and no further calibration is required, the more accurate wavenumber allowed new and improved molecular constants and band origins, making it possible to obtain more reliable values for previously reported molecular constants. With these new constants, a new set of spin-vibronic term values was determined and compared to the values already reported in the literature. (C) 2020 Elsevier Ltd. All rights reserved.