Empirical Lower State Energies of 13CH_4 at 1.66 μm Using 296 K and 81 K Spectra

Details Empirical Lower State Energies of 13CH_4 at 1.66 μm Using 296 K and 81 K Spectra Empirical Lower State Energies of 13CH_4 at 1.66 μm Using 296 K and 81 K Spectra

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confete07l&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Atmospheric Species

Scientific paper

The high resolution absorption spectra of 13CH_4 were recorded at 81 K by differential absorption spectroscopy using a cryogenic cell and a series of Distributed Feed Back (DFB) diode lasers at room temperature by Fourier transform spectroscopy (a Bruker IFS-125HR at JPL). Empirical line lists were constructed containing, respectively, 1629 13CH_4 transitions detected at 81 K (5852 - 6124 cm-1) and 3481 features measured at room temperature (5850 - 6150 cm-1); the minimum observed intensities were, respectively, 3×10-26 and 4×10-25 cm/molecule at 81 K and 296 K. From the variation of the cold and room temperaure line intensities, empirical lower state energies were derived for 1196 13CH_4 transitions. Over 400 additional weak features, detected at 81 K, could not be matched to lines observed at room temperature. The observed intensities represent 99.2% and 84.6% of the total absorbance at 81 K and 296 K, respectively. The quality of the resulting empirical low energy values is demonstrated by the excellent agreement with the already-assigned transitions and the clear propensity of the empirical low J values to be close to integers.
Part of the research described in this paper was performed the Jet Propulsion Laboratory, California Institute of Technology, under contracts and cooperative agreements with the National Aeronautics and Space Administration.

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