First High-Resolution Analyses of the Ņ8 and Ņ8 + Ņ9 Spectral Regions of 35 CIONO2: Determination of the Ņ9 Band Centre
J.- M. Flaud, Walter J. Lafferty, J Orphal, M Birk, G Wagner
A ro-vibrational analysis of the C-type Ņ8 fundamental band of 35CIONO2 as well as the hot band, Ņ8 + Ņ9 - Ņ9, has been carried out using a Fourier-transform infrared spectrum of natural chlorine nitrate recorded with a resolution of 0.0094 cm-1 at a temperature of 190K. Accurate upper state constants have been determined for both bands including following band centers: Ņ0 (Ņ8) = 711.20763(9) and Ņ0(Ņ8+Ņ9) = 714.9050(12)cm-1. These constants have been used, together with a transition moment operator which takes into account the observed Herman-Wallis effect, to successfully model the experimental spectrum. In addition, the constants of the 8191 state have been used to model the Ņ8 + Ņ9 band, allowing us to assign nearly 100 Q-branch transitions and, therefore, to determine the band center of the Ņ8 + Ņ9 band, Ņ0(Ņ8+Ņ9) = 838.6369(15) cm-1. Consequently this allows us to obtain the band center of Ņ9: Ņ0(Ņ9) = 123.7219(20) cm-1. This establishes unambiguously that the band at 714.9 cm-1 previously attributed to Ņ5 + Ņ7 - Ņ9 is actually the Ņ8 + Ņ9-Ņ9 hot band.
, Lafferty, W.
, Orphal, J.
, Birk, M.
and Wagner, G.
First High-Resolution Analyses of the Ņ<sub>8</sub> and Ņ<sub>8</sub> + Ņ<sub>9</sub> Spectral Regions of <sup>35</sup> CIONO<sub>2</sub>: Determination of the Ņ<sub>9</sub> Band Centre, Molecular Physics
(Accessed December 8, 2023)