Pressure-induced line mixing in the ν4 band of NH3 perturbed by O2 and self-perturbed

Pressure-induced line-mixing parameters of 231 rovibrational transitions of several branches in the ν4 band of ammonia perturbed by O2 have been measured at room temperature (295K) using a high-resolution Fourier transform spectrometer. The line-mixing parameters were obtained using the method of multi-spectrum fitting to the measured shapes of the lines, including the interference effects caused by the line overlaps.