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 Title: MEASUREMENT AND MODELING OF COLD 13CH4 SPECTRA FROM 2.1 TO 2.7 _m Author(s): Sung, Keeyoon Contributor(s): Mantz, Arlan; Smith, Mary Ann H.; Tyuterev, Vladimir; Rey, Michael; Tashkun, Sergey; Nikitin, Andrei V.; Crawford, Timothy J.; Brown, Linda Subject(s): Small molecules Abstract: A new study of $^{13}$chem{CH_4}line positions and intensities in the Octad region between 3600 and 4800 wn will be reported. Nine spectra were recorded with two Fourier transform spectrometers (the McMath-Pierce FTS at Kitt Peak Observatory and the Bruker 125 HR FTS at the Jet Propulsion Laboratory) using $^{13}$C-enriched samples at temperatures from 299 K to 80 K. Line positions and intensities were retrieved by non-linear least squares curve-fitting procedures and analyzed using the effective Hamiltonian and the effective Dipole moment expressed in terms of irreducible tensor operators adapted to spherical top molecules. Quantum assignments were found for all the 24 sub-vibrational states of the Octad (some as high as J=10). Over 4750 experimental line positions and 3300 line intensities were fitted with RMS standard deviations of 0.004 wn and 6.9%, respectively. A new linelist of over 9600 measured positions and intensities from 3607 to 4735 wn was produced, with known quantum assignments given for 45% of the features.$^{a}$ $^{a}$ Part of the research described in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, NASA Langley Research Center, and Connecticut College, under contracts and cooperative agreements with the National Aeronautics and Space Administration. The support of the Groupement de Recherche International SAMIA between CNRS (France) and RFBR (Russia) is acknowledged. Issue Date: 22-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79443 Date Available in IDEALS: 2016-01-05
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