The High-Resolution Infrared Spectrum of Nitryl Chloride: Rotational Analysis of the 35CINO 2 ν 4 Band Around 6 μm

• Published in: Journal of molecular spectroscopy Vol. 165; no. 2; pp. 315 - 322
• Main Authors: Orphal, J., Morillonchapey, M., Guelachvili, G.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 1994
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1006/jmsp.1994.1135

Nitryl chloride (ClNO 2) is involved in heterogeneous stratospheric chemistry by the reaction of HCI with N 2O 5 on polar stratospheric cloud particles. The present work reports the first high-resolution infrared absorption spectra of nitryl chloride. We have recorded two infrared absorption spectra of ClNO 2 at room temperature between 450 and 2450 cm −1 with a stepping-mode Fourier transform spectrometer at 0.0028 cm −1 nonapodized resolution. The spectrum shows rich. well-resolved rotational structure in the ν 6 (652 cm −1), ν 2 (792 cm −1), ν 1 (1268 cm −1), 2ν 6 (1318 cm −1), and ν 4 (1684 cm −1) bands. We have carried out a rotational analysis of the ν 4 band of 35ClNO 2 around 1684 cm −1, leading to the assignment of 1691 b-type transitions. We have determined new rotational constants for the ground state, and the rotational constants for the v 4 = 1 vibrational state.