Line Positions And Intensities For The Ν12 Band Of 13c12ch6

High-resolution, high signal-to-noise spectra of mono-substituted $^{13}$C-ethane ($^{13}$C$^{12}$CH$_6$) in the 12.2 $\mu$m region were recorded with a Bruker IFS 125HR Fourier transform spectrometer. The spectra were obtained for four sample pressures at three different temperatures between 130 and 208 K using a 99$\%$ $^{13}$C-enriched ethane sample contained in a 20.38-cm long coolable absorption cell\footnote{K.~Sung, A.~W.~Mantz, L.~R.~Brown, \textit{et al.}, \textit{J. Mol. Spectrosc.} \underline{\textbf{162}} (2010) 124-134.}. A multispectrum nonlinear least squares fitting technique\footnote{D.~C.~Benner, C.~P.~Rinsland, V.~Malathy Devi, M.~A.~H.~Smith and D.~Atkins, \textit{JQSRT} \underline{\textbf{53}} (1995) 705-721.} was used to fit the same intervals in the four spectra simultaneously to determine line positions and intensities. Similar to our previous analyses of $^{12}$C$_2$H$_6$ spectra in this same region\footnote{V.~Malathy Devi, C.~P.~Rinsland, D.~Chris Benner, \textit{et al.}, \textit{JQSRT} \underline{\textbf{111}} (2010) 1234-1251; V.~Malathy Devi, D.~Chris Benner, C.~P.~Rinsland, \textit{et al.}, \textit{JQSRT} \underline{\textbf{111}} (2010) 2481-2504.}, constraints were applied to accurately fit each pair of doublet components arising from torsional Coriolis interaction of the excited $\nu_{12} = 1$ state with the nearby torsional $\nu_6 = 3$ state. Line intensities corresponding to each spectrum temperature (130 K, 178 K and 208 K) are reported for 1660 $\nu_{12}$ absorption lines for which the assignments are known, and integrated intensities are estimated as the summation of the measured values. The measured line positions and intensities (re-scaled to 296 K) are compared with values in recent editions of spectroscopic databases.\footnote{Research described in this paper was performed at Connecticut College, the College of William and Mary, NASA Langley Research Center and the Jet Propulsion Laboratory, California Institute of Technology, under contracts and cooperative agreements with the National Aeronautics and Space Administration.