New High Resolution Spectroscopy Studies of Methyl Nitrite CH_3ONO

Physics

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Atmospheric Species And Processes

Scientific paper

Methyl nitrite CH3ONO is an important species in atmospheric chemistry involved in photochemical oxidation of volatile organic compounds. The cis conformer (more stable by about 298 cm-1) has a high internal rotation potential barrier for the methyl group (731 cm-1) whereas for the trans conformer the barrier to internal rotation is extremely low (10 cm-1), leading to large internal rotation splittings. Only one high resolution infrared study was performed prior to this study. For the first time, high-resolution spectrum of CH3ONO was recorded in the far infrared region (30-500 cm-1) using the synchrotron SOLEIL far-infrared beamline (AILES) and a Fourier transform (FT) spectrometer. Some 987 lines were assigned for the cis isomer up to J=65 and combined with 66 previously recorded microwave lines. In addition, high-resolution spectrum of the ν9 band of the cis isomer around 627.9 cm-1 was also recorded using the FT spectrometer at LISA. New microwave data is currently recorded to improve the knowledge of both the cis and trans ground state parameters.
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L. M. Goss, C. D. Mortensen and T. A. Blake, J. Mol. Spectrosc., 225, 182-188 (2004)

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