MEASUREMENTS OF AIR-BROADENED, N2-BROADENED, AND O2-BROADENED HALF-WIDTHS AND PRESSURE-INDUCED LINE SHIFTS IN THE NU-3 BAND OF (CH4)-C-134

Air-, nitrogen-, and oxygen-broadened halfwidth and pressure-induced line shift coefficients have been measured for over seventy-five individual vibration-rotation transitions in the nu-3 fundamental band of (CH4)-C-13 at 3-mu-m from room temperature IR laboratory absorption spectra recorded at a 0.01-cm-1 resolution with a Fourier transform spectrometer. Transitions up to J" = 13 in the P-branch and J" = 7 in the R-branch were analyzed using a nonlinear least-squares curve fitting technique assuming a Voigt line shape. From the analysis, we have determined the mean ratios of air- to nitrogen-broadened and air- to oxygen-broadened halfwidth coefficients obtained for the same transitions as 1.00 +/- 0.03 and 1.06 +/- 0.04, respectively. The measured pressure shift coefficients were predominantly negative, and the mean and standard deviation values for air-, nitrogen-, and oxygen-broadened shifts were -0.0067 +/- 0.0032, -0.0068 +/- 0.0041, and -0.0066 +/- 0.0028 cm-1 atm-1, respectively. Comparisons are made with the results obtained for similar transitions in the nu-3 band of (CH4)-C-12 and the nu-4 band of (CH4)-C-13.