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Reinvestigation of the microwave and new high resolution far-infrared spectra of cis-methyl nitrite, CH3ONO: Rotational study of the two first torsional states

Abstract : The first far-infrared high resolution absorption measurement of the cis-methyl nitrite molecule has been recorded in the range 15-400 cm−1 using the synchrotron AILES beamline radiation at SOLEIL with a resolution of 0.0011 cm−1. First assignments for the pure rotational transitions (15-65 cm−1) belonging to the ground νt (=ν15) = 0 and first νt = 1 excited torsional state are based on measurements from previous studies performed in the 13-40 GHz spectral range, as well as on new millimeter-wave measurements performed at Lille in the spectral range 75-465 GHz. A few measurements and remeasurements in the 1.8-13 GHz were also performed using the chirped FT-MW spectrometer located in North Texas. The pure rotational transitions in the far-infrared and in the microwave spectral range belonging to the two first torsional states have been globally fitted using the RAM ("Rho Axis Method") dealing with the rotation-torsion Hamiltonian and implemented in the BELGI code. A total of 708 and 713 microwave transitions (6 ⩽ J ⩽ 40, View the MathML source ⩽ 23) belonging to the ground torsional state νt = 0 and 1 have been fitted with root-mean-square (rms) deviations of 37.4 kHz and 32.3 kHz respectively, and 3170 pure rotational transitions in the far-infrared range (12 ⩽ Jmax ⩽ 65, 0 ⩽ View the MathML source ⩽ 48) belonging to νt = 0 and 1 have been fitted with a rms deviation of 0.00017 cm−1, using 35 parameters. Since in the far-infrared spectral range, the A-E internal rotor splittings have not been observed for the transitions belonging to the torsional ground νt = 0 state of the cis-methyl nitrite species, another fit was performed on those lines, using a Watson type Hamiltonian for comparison.
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https://hal.archives-ouvertes.fr/hal-00753594
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Submitted on : Monday, November 19, 2012 - 2:30:43 PM
Last modification on : Tuesday, October 19, 2021 - 6:59:20 PM

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V. Sironneau, P. Chelin, Fridolin Kwabia Tchana, Isabelle Kleiner, Olivier Pirali, et al.. Reinvestigation of the microwave and new high resolution far-infrared spectra of cis-methyl nitrite, CH3ONO: Rotational study of the two first torsional states. Journal of Molecular Spectroscopy, Elsevier, 2011, 267 (1-2), pp.92-99. ⟨10.1016/j.jms.2011.02.014⟩. ⟨hal-00753594⟩

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