The weak high-resolution absorption spectrum of natural nitrous oxide has been recorded by high sensitivity cavity ring down spectroscopy (CRDS) near 1.18 µm. The frequency scale of the spectra was obtained by coupling the CRDS spectrometer to a self-referenced frequency comb. The room temperature recordings, performed with a pressure of 1 Torr, cover the 8325-8622 cm⁻¹ spectral interval where previous observations were very scarce. More than 3300 lines belonging to four N₂O isotopologues (¹⁴N₂¹⁶O, ¹⁴N¹⁵N¹⁶O, ¹⁵N¹⁴N¹⁶O, and ¹⁴N₂¹⁸O) are measured with a position accuracy better than 1 × 10⁻³ cm⁻¹ for most of the lines. Line intensities at room temperature range between 1.2 × 10⁻²⁵ and 3.8 × 10⁻³⁰ cm/molecule. The rovibrational assignments were obtained by comparison with predictions based on the global modeling of the line positions and intensities performed within the framework of the method of effective operators. The band-by-band analysis led to the determination of the rovibrational parameters of a total of 47 bands. All identified bands belong to the ΔP= 14-16 series of transitions, where P=2V₁+V₂+4V₃ is the polyad number (V_{i= 1-3} are the vibrational quantum numbers). Among these bands, only five were previously observed and bands of the ΔP= 15 series are reported for the first time. Local resonance perturbations affecting two bands are identified and analyzed. The position and intensity comparisons to the HITRAN2016 and HITEMP2019 spectroscopic databases are discussed. The HITRAN line list is limited to only four (calculated) bands of the ¹⁴N₂¹⁸O isotopologue in the studied region while ΔP= 15 bands are missing in the HITEMP list. The present work will help to improve future versions of the spectroscopic databases of nitrous oxide, a strong greenhouse gas.

天然一氧化二氮的弱高分辨率吸收光谱已通过1.18 µm附近的高灵敏度腔衰荡光谱（CRDS）记录。频谱的频率范围是通过将CRDS频谱仪耦合到自参考频率梳获得的。室温记录是在1托的压力下进行的，覆盖了8325-8622 cm ^-1的光谱区间，以前的观察很少。属于4个N ₂ O同位素的3300多个谱线（¹⁴ N ₂ ¹⁶ O，¹⁴ N ¹⁵ N ¹⁶ O，¹⁵ N ¹⁴ N ¹⁶ O和¹⁴ N ₂¹⁸ O）与一个位置精度测量优于1×10 ^-3厘米^-1为大多数线。室温下的线强度范围为1.2×10 ^-25至3.8×10 ^-30 cm /分子。通过与基于在有效算子方法框架内执行的线位置和强度的全局建模的预测进行比较，获得了振动分配。通过逐个频带的分析，可以确定总共47个频带的振动参数。所有识别出的频带都属于ΔP = 14-16过渡系列，其中P = 2 V ₁ + V ₂ +4 V₃是多分数（V _{I = 1-3}是振动量子数）。在这些频带中，先前仅观察到五个，并且首次报告了ΔP = 15系列的频带。识别并分析了影响两个频带的局部共振扰动。讨论了与HITRAN2016和HITEMP2019光谱数据库的位置和强度比较。在研究区域中，HITRAN谱线列表仅限于¹⁴ N ₂ ¹⁸ O同位素分子的四个（计算）谱带，而HITEMP谱表中缺少ΔP = 15谱带。目前的工作将有助于改进未来版本的一氧化二氮（一种强温室气体）的光谱数据库。