Diode-Laser Measurements of N₂-Broadening Coefficients in the ν₇ Band of C₂H₄

N-broadening coefficients have been measured for 35 lines of CH in the ν fundamental transition, using a tunable diode-laser spectrometer. These lines with 3 ≤ J″ ≤ 23, 0 ≤ K″ ≤ 4, and 1 ≤ K″ ≤ 22 are located in the spectral range 880-1024 cm. The collisional half-widths are obtained by modeling each spectral line with a Voigt and a Rautian profile. The measured broadening coefficients belonging to transitions with the same J″ generally increase with increasing K″ and the coefficients decrease on the whole with increasing J″. These behaviors can be predicted by an approximate semiclassical calculation performed by approximating ethylene to a prolate symmetric-top molecule.