Intensities and collision-broadened line widths have been measured in the &ngr;4-fundamental band of 13CH4 at 295 K, employing the Doppler-limited spectral resolution of a tunable diode laser spectrometer and a 13C- enriched sample of CH4, H2, He, Ar, N2, O2, and air were chosen as the broadening gases in order to provide the data needed in atmospheric and planetary atmospheric applications. ¿ American Geophysical Union 1989