First High-Resolution Analyses of the Ņ8 and Ņ8 + Ņ9 Spectral Regions of 35 CIONO2: Determination of the Ņ9 Band Centre

Published

May 1, 2003

Author(s)

J.- M. Flaud, Walter J. Lafferty, J Orphal, M Birk, G Wagner

Abstract

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.

Citation

Molecular Physics

Volume

101

Issue

10

Pub Type

Journals

Keywords

chlorine nitrate, Herman-Wallis effect, high-resolution infrared spectrum, line intensities, rotation constants

Citation

Flaud, J. , Lafferty, W. , Orphal, J. , Birk, M. and Wagner, G. (2003), First High-Resolution Analyses of the Ņ₈ and Ņ₈ + Ņ₉ Spectral Regions of ³⁵ CIONO₂: Determination of the Ņ₉ Band Centre, Molecular Physics (Accessed October 13, 2024)