Collisional broadening and shift coefficients as well as Dicke narrowing parameters have been measured at room temperature in the 2ν₄ band of NH₃ perturbed by O₂ and N₂ for 310 rovibrational lines with rotational quantum numbers 1 ≤ J ≤ 11 and 0 ≤ K ≤ 11.

The experiments were performed at room temperature with ammonia mixtures in nitrogen and oxygen at different pressures using a high-resolution Fourier transform spectrometer and a mono-spectrum non-linear least squares fitting of Voigt and soft-collision Galatry profiles. Because of Dicke narrowing effect, departure from the Voigt profile is observed that allowed measurement of narrowing parameters for about 100 transitions of the 2ν₄ band. The collisional broadening coefficients obtained with Galatry profile are larger by about 5% than those derived from Voigt profile. Average absolute accuracies of the measurements are estimated to be 5%, 10% and 14% for broadening, shift and narrowing coefficients, respectively.

Air-broadening coefficients were retrieved from the linear combination of O₂- and N₂-broadening coefficients. The results are in good agreement with previous experimental data available in the literature. The whole set of results is given as supplementary material for a possible use in spectroscopic databases.

迪克缩小参数已经在2在室温下测量碰撞增宽和移位系数以及ν ₄ NH的带₃扰动被O ₂和N ₂为310条振转线与旋转量子数1≤ Ĵ ≤11和0≤ ķ ≤11。

使用高分辨率傅里叶变换光谱仪和Voigt的单谱非线性最小二乘拟合和软碰撞Galatry曲线，在室温下以不同压力在氮气和氧气中的氨混合物在室温下进行实验。由于Dicke变窄效应，观察到偏离Voigt轮廓，可以测量2 v ₄波段约100个跃迁的变窄参数。用Galatry剖面获得的碰撞展宽系数比从Voigt剖面获得的碰撞展宽系数大约5％。对于加宽系数，移动系数和变窄系数，测量的平均绝对精度估计分别为5％，10％和14％。

从O _2-和N _2-膨胀系数的线性组合中检索出空气膨胀系数。结果与文献中的先前实验数据高度吻合。整个结果集作为补充材料提供，可以在光谱数据库中使用。