Two sets of NH${}_3$ absorption spectra covering the 0.793 $\mu$m region are recorded using two Bruker IFS 125 HR Fourier transform spectrometers. Three unapodized absorption spectra are recorded in Brussels over the range $11000-14500$ cm${}^{-1}$ and the positions and intensities of 1114 ammonia lines observed in the $12491-12810$ cm${}^{-1}$ region are measured using a multi-spectrum least squares fitting algorithm. 367 additional lines are identified in an ammonia absorption spectrum recorded in two steps at the J. Heyrovsky Institute of Physical Chemistry in Prague, using two different interference filters covering the $12000-12500$ and $12400-13000$ cm${}^{-1}$ ranges. The 1481 measured ammonia lines are analyzed using an empirical line list computed using variational nuclear motion calculations and ground state combination differences. Transitions are assigned to vibrational states with $4{\nu }_{NH}$ stretching excitation $(v_1+v_3=4)$. 278 out of the 1481 measured lines are assigned to 300 transitions and 119 upper state energy levels are derived from the frequencies of the assigned transitions.

两套NH${}_3$ 吸收光谱覆盖 0.793 $\mu$m 区域使用两个布鲁克 IFS 125 HR 傅立叶变换光谱仪记录。在布鲁塞尔的范围内记录了三个未变迹的吸收光谱$11000-14500$ 厘米${}^{-1}$ 以及 1114 条氨线的位置和强度 $12491-12810$ 厘米${}^{-1}$使用多谱最小二乘拟合算法测量区域。在布拉格 J. Heyrovsky 物理化学研究所分两步记录的氨吸收光谱中识别出 367 条额外的谱线，使用两种不同的干涉滤光片覆盖$12000-12500$ 和 $12400-13000$ 厘米${}^{-1}$范围。使用变分核运动计算和基态组合差异计算的经验线列表分析了 1481 条测量的氨线。过渡被分配给振动状态$4{\nu }_{NH}$ 拉伸激发 $(v_1+v_3=4)$. 1481 条测量线中的 278 条被分配给 300 个跃迁，119 个上能级是从分配的跃迁频率得出的。