Line shift and mixing in the ν4 and 2 ν2 band of NH 3 perturbed by H 2 and Ar

Abstract

Pressure induced line shift and line mixing parameters have been measured for 66 rovibrational lines in the ν 4 band and for 10 lines in the 2 ν 2 band of NH 3 perturbed by H 2 and Ar at room temperature ( T = 296 K). These lines with J values ranging from 2 to 10 are located in the spectral range 1450–1600 cm −1. Experiments were made with a high-resolution Fourier transform spectrometer. The line shifts and line mixing parameters have been derived from the non-linear least-square multi-pressure fitting technique. The shift coefficients are compared with those calculated from the Robert–Bonamy formalism (RB). The results are generally in satisfactory agreement with the experimental data.