The near infrared cavity-enhanced absorption spectrum of methyl cyanide

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O'Leary, Deirdre M.
Ruth, Albert A.
Dixneuf, Sophie
Orphal, Johannes
Varma, Ravi M.
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The absorption spectrum of methyl cyanide (CH3CN) has been measured in the near IR between 6000 and 8000 cm(-1) with a resolution of 0.12 cm(-1) using Fourier transform incoherent broadband cavity-enhanced absorption spectroscopy. The spectrum contains several weakly perturbed spectral regions: potential vibrational combination bands contributing to the spectrum are outlined. Line positions and cross-sections of CH3CN between 6814 and 7067 cm(-1) have been measured at high-resolution of 0.001 cm(-1) using diode laser based off-axis cavity-enhanced absorption spectroscopy. A total of 4630 new absorption lines of CH3CN are identified in this region. A value for the self-broadening coefficient has determined to be (3.3 +/- 0.2) X 10(-3) cm(-1) mbar(-1) for one isolated line at 7034.171 cm(-1). Several line series have been identified in these regions and an autocorrelation analysis performed with a view to aiding future assignments of the rotational-vibrational transitions.
Methyl cyanide , Acetonitrile , Fourier transform cavity-enhanced spectroscopy , Broadband absorption , High resolution , Positive ion composition , Microwave limb sounder , Band light-source , Stratospheric CH3CN , Acetonitrile CH3CN , Molecular cloud , Cross-sections , NU-7 bands , CM(-1)
O'Leary, D.M., Ruth, A.A., Dixneuf, S., Orphal, J., Varma, R. (2012) 'The near infrared cavity-enhanced absorption spectrum of methyl cyanide'. Journal of Quantitative Spectroscopy & Radiative Transfer, 113 :1138-1147. doi: 10.1016/j.jqsrt.2012.02.022
Copyright © 2012, Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Quantitative Spectroscopy & Radiative Transfer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Quantitative Spectroscopy & Radiative Transfer, [113, July 2012]