High-resolution infrared spectrum of the ν1 band of OClO

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Abstract

The infrared absorption spectrum of the ν1 band of OClO (care must be taken to distinguish it from ClOO, which also exists) has been recorded in the 950 cm−1 region, with a Fourier transform infrared spectrometer with an instrumental resolution of ∼0.004 cm−1. Most lines appear as doublets owing to the spin-rotation interaction present in this molecule. Around 2800 lines have been assigned for the 35ClO2 species and ∼800 for the 37ClO2 species. In addition, a number of lines of the “hot band”, ν1 + ν2ν2, have been assigned for the 35ClO2 species. Effective rotational and spin-rotational spectroscopic constants have been obtained for the ground and the v1 = 1 vibrational states of 35ClO2 and 37ClO2 and the corresponding band origins have also been determined. Fermi resonance between the 2ν2 and ν1 bands has been found to be negligible; however, a weak resonance between the Ka = 7 levels of v1 = 1 and the Ka = 9 levels of v2 = 2 has been observed. The measured integrated ν1 band strength is 87 ± 6 cm−2 atm−1 at 300 K.

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    • High resolution spectroscopy of the ν<inf>1</inf>+ν<inf>3</inf> band of the 35ClO<inf>2</inf> free radical: Spin–rotation–vibration interactions

      2022, Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
      Citation Excerpt :

      All these applications make chlorine dioxide an important object for spectroscopic investigation and, in consequence, many laboratory studies of ClO2 rotational, [33–42], electronic, [43–48], and low resolution ro–vibrational infrared spectra, [49–53], have been done in recent before years. However high–resolution infrared spectra of ClO2 were discussed only in a few studies and most of them have been performed before 1993 at lower resolutions available at that time, Refs. [54–60]. For the present study only one infrared spectrum of ClO2 has been recorded in Braunschweig in the spectral region of 1700–3000 cm−1 with the Bruker IFS125HR Fourier transform infrared spectrometer (Zürich prototype [62]).

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