The oxygen A-band near 760 nm is used to determine the air-mass along the line of sight from ground or space borne atmospheric spectra. This band is located in a spectral region of very weak absorption of water vapor. The increased requirements on the determination of the air columns make suitable to accurately characterize water absorption spectrum in the region. In the present work, we use a cavity ring down spectrometer newly developed in Tomsk, to measure with unprecedented sensitivity and accuracy the water spectrum in the 12969 - 13172 cm⁻¹ region. While about fifty transitions were previously detected in the region, a total of about 580 water lines are measured by CRDS and rovibrationally assigned, leading to the determination of 103 new levels and correction of 134 levels of H₂¹⁶O. Spectroscopic line lists available in the region (HITRAN, W2020 and theoretical line lists) show some important deviations compared to observations. In particular, line intensities are poorly predicted by available ab initio calculations for transitions involving a highly bending excitation.

760 nm 附近的氧气 A 波段用于从地面或太空大气光谱确定沿视线的空气质量。该波段位于水蒸气吸收非常弱的光谱区域。对确定空气柱的要求增加，适合准确表征该区域的吸水光谱。在目前的工作中，我们使用托木斯克新开发的腔衰荡光谱仪，以前所未有的灵敏度和准确度测量 12969 - 13172 cm ^-1区域的水谱。虽然之前在该地区检测到约 50 条跃迁，但通过 CRDS 测量并通过振动分配总共约 580 条水线，从而确定了 103 个新水平并修正了 134 个 H ₂水平¹⁶ O. 该地区可用的光谱线列表（HITRAN、W2020 和理论线列表）与观测结果相比存在一些重要偏差。特别是，对于涉及高度弯曲激发的过渡，可用的从头计算很难预测线强度。