The Rotational Spectrum of Chlorine Nitrate (CIONO2) in the Four Lowest nv9 Polyads

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The analysis of the recently recorded 78–378 GHz broadband spectrum of ClONO2 has been extended to cover rotational transitions in all 14 excited vibrational states up to 650 cm−1 above the ground state. We report new measurements and analysis of the 2ν9 and 3ν9 dyads, and first assignment and analysis for the 4ν9 and 5ν9 triads. The polyad fits encompass a total of over 20 000 newly measured transition frequencies and spectroscopic constants are reported for 10 vibrationally excited states in each of 35ClONO2 and37ClONO2. All polyads were fitted with a new coupling scheme between the perturbing states combining c-axis Coriolis and Fermi interactions. The scheme is validated by multiple tests of the physical significance of the derived parameters and it results in improved deviations of fits and significant reduction in the number of adjustable parameters.



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