The rotational spectrum of water vapour highly enriched in ¹⁸O has been studied by high resolution (≈ 0.001 cm⁻¹) Fourier transform spectroscopy at the AILES beam line of the SOLEIL synchrotron. The room temperature absorption spectrum has been recorded between 40 and 700 cm⁻¹. The ¹⁸O enrichment of the sample was about 97% while the gas pressure and the absorption pathlength were set to 0.97 mbar and 151.75 m, respectively. The spectrum contains more than 4800 rotational transitions from seven water isotopologues (H₂¹⁸O, H₂¹⁶O, H₂¹⁷O, HD¹⁸O, HD¹⁶O, HD¹⁷O, D₂¹⁸O). The assignments were performed using known experimental energy levels as well as calculated line lists based on the results of Schwenke and Partridge. The amount and accuracy of the reported line positions represent an important extension compared to previous works. Overall, lines of about 2570 transitions are observed for the first time and 35, 41, 50, and 16 new energy levels are determined for H₂¹⁸O, H₂¹⁷O, HD¹⁸O, and HD¹⁷O, respectively. The set of derived energy levels shows a number of important differences from those recommended by an IUPAC-task group. Compared to the HITRAN2016 database, numerous deviations of line positions (up to 0.15 cm⁻¹) are found for the H₂¹⁷O, H₂¹⁸O, HD¹⁷O, and HD¹⁸O species. Incomplete and wrong HITRAN's assignments of more than 90 transitions for H₂¹⁸O, H₂¹⁷O and HD¹⁸O are identified. Overall, the measured line positions will allow to significantly refine and complete the sets of empirical energy levels of H₂¹⁸O, H₂¹⁷O, HD¹⁸O and HD¹⁷O in the ground vibrational state.

在SOLEIL同步加速器的AILES光束线上通过高分辨率（≈0.001 cm ^-1）傅里叶变换光谱研究了高度富集¹⁸ O的水蒸气的旋转光谱。已经记录了室温吸收光谱在40至700cm ^-1之间。样品的¹⁸ O富集度约为97％，而气压和吸收路径长度分别设置为0.97 mbar和151.75 m。该光谱包含来自7个水同位素的4800多个旋转跃迁（H ₂ ¹⁸ O，H ₂ ¹⁶ O，H ₂ ¹⁷ O，HD ¹⁸ O，HD ¹⁶ O，HD ¹⁷O，D ₂ ¹⁸ O）。使用已知的实验能级以及根据Schwenke和Partridge的结果计算的线列表进行分配。与以前的工作相比，报告的线位置的数量和准确性代表了重要的扩展。总体而言，首次观察到约2570个跃迁的谱线，分别为H ₂ ¹⁸ O，H ₂ ¹⁷ O，HD ¹⁸ O和HD ¹⁷ O确定了35、41、50和16个新的能级。一组导出的能量级别显示出与IUPAC任务组建议的那些有很多重要差异。与HITRAN2016数据库相比，线位置存在许多偏差（最大0.15厘米）对于H ₂ ¹⁷ O，H ₂ ¹⁸ O，HD ¹⁷ O和HD ¹⁸ O种类发现^-1）。识别出HITRAN对H ₂ ¹⁸ O，H ₂ ¹⁷ O和HD ¹⁸ O进行了90个以上转换的不完整和错误。总体而言，在地面振动状态下，测量的线位置将允许显着改善和完善H ₂ ¹⁸ O，H ₂ ¹⁷ O，HD ¹⁸ O和HD ¹⁷ O的经验能级集。