15min:

M. A. H. SMITH, Science Directorate, NASA Langley Research Center, Hampton, VA 23681; K. SUNG, L. R. BROWN, T. J. CRAWFORD, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr.,Pasadena, CA 91109; A. W. MANTZ, Dept. of Physics, Astronomy and Geophysics, Connecticut College, New London, CT 06320; V. MALATHY DEVI AND D. CHRIS BENNER, The College of William and Mary, Williamsburg, VA 23187.

High-resolution spectra of the ₄ fundamental band of ¹³CH₄ broadened by N₂ at temperatures relevant to the atmosphere of Titan were recorded using temperature-controlled absorption cells installed in the sample compartment of a Bruker IFS-125HR Fourier Transform spectrometer (FTS) at the Jet Propulsion Laboratory (JPL). Analysis of these spectra using multispectrum fitting has determined half widths, pressure-induced shifts, line mixing parameters and their temperature dependences for transitions belonging to a number of P- and R-branch J-manifolds. The analysis examined in detail the temperature-dependence of N₂-broadened half width and pressure-induced shift coefficients over the entire temperature range from 80 K to 296 K. The results are compared with other published measurements of N₂- and air-broadened methane parameters.