Knowledge Bank

High-resolution spectra of vibration-rotation transitions in $3\nu 3$ of both $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}CH4$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}CH4$ have been obtained using the Kitt Peak Fourier Transform Spectrometer and a 6 m White $cell.1$ This work reports the results of measurements of self- and foreign gas-broadened linewidths in both isotopic species. The broadening gases included helium and molecular hydrogen and nitrogen. These experimental values will be compared with earlier theoretical calculations of collision-broadened $linewidths.2$ Implications for atmospheric phenomena will be considered. $\mathrm{<mrow\; data-mjx-texclass="ORD">\ast </mrow>}$This research is supported, in part, by the NASA Planetary Atmospheres Program. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$J. W. Brault, K. Fox, D. E. Jennings, and J. S. Margolis, Ap. J. 247, L101 (1981). $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$G. D. T. Tejwani, P. Varanasi, and K. Fox, J. Quant. Spect. Rad. Transf. 15, 243 (1975).""