Network-Based Design of Near-Infrared Lamb-Dip Experiments and the Determination of Pure Rotational Energies of H218O at kHz Accuracy
Network-Based Design of Near-Infrared Lamb-Dip Experiments and the Determination of Pure Rotational Energies of H218O at kHz Accuracy
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基于网络的近红外 Lamb-Dip 实验设计和 kHz 精度 H218O 纯旋转能量的测定
DOI：
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
A. Császár
中科院分区：
文献类型：
--
作者：
M. Diouf;Roland Tóbiás;Irén Simkó;F. Cozijn;E. Salumbides;W. Ubachs;A. Császár
利用噪声免疫腔增强光学外差分子光谱 (NICE-OHMS)（频率梳辅助兰姆浸饱和光谱技术的一种变体）的极高绝对精度、灵敏度和分辨率，建立了 H218O 两种核自旋异构体的旋转量子级结构，平均精度为 2.5 kHz。总共探测了 195 个精心挑选的旋转跃迁。 NICE-OHMS 的超高灵敏度允许观察室温吸收强度低至 10−27 cm molecular−1 的谱线，而卓越的分辨率能够检测分离仅为 286(17) kHz 的双峰。虽然 NICE-OHMS 实验是在 7000–7350 cm−1 的近红外窗口中进行的，但观察到的线可以确定 H218O 对应于最高 8 的 J 值的所有纯旋转能，其中 J 是总旋转量子数。网络和量子理论都被用来促进测量活动和对所解析线路的充分利用。例如，为了最大限度地减少实验工作量，通过基于扩展里兹原理、光谱网络理论和量子化学起源的基础数据集构建的光谱网络辅助精密光谱（SNAPS）方案来选择观察目标的跃迁。为了确保 H218O 两种核自旋异构体的超精密旋转振动线的整体连接，NICE-OHMS 转变通过文献中的 6 条精确微波线进行了增强。为了产生绝对的邻H218O能量，最低的邻能量被确定为23.754 904 61(19) cm−1。根据本研究中确定的超高精度能量值推导出 1546 个跃迁的参考基准质量线列表，为未来 0-1250 和 5900-8380 cm−1 之间的高分辨率光谱实验提供校准标准。
Taking advantage of the extreme absolute accuracy, sensitivity, and resolution of noise-immune-cavity-enhanced optical-heterodyne-molecular spectroscopy (NICE-OHMS), a variant of frequency-comb-assisted Lamb-dip saturation-spectroscopy techniques, the rotational quantum-level structure of both nuclear-spin isomers of H218O is established with an average accuracy of 2.5 kHz. Altogether, 195 carefully selected rovibrational transitions are probed. The ultrahigh sensitivity of NICE-OHMS permits the observation of lines with room-temperature absorption intensities as low as 10−27 cm molecule−1, while the superb resolution enables the detection of a doublet with a separation of only 286(17) kHz. While the NICE-OHMS experiments are performed in the near-infrared window of 7000–7350 cm−1, the lines observed allow the determination of all the pure rotational energies of H218O corresponding to J values up to 8, where J is the total rotational quantum number. Both network and quantum theory have been employed to facilitate the measurement campaign and the full exploitation of the lines resolved. For example, to minimize the experimental effort, the transitions targeted for observation were selected via the spectroscopic-network-assisted precision spectroscopy (SNAPS) scheme built upon the extended Ritz principle, the theory of spectroscopic networks, and an underlying dataset of quantum chemical origin. To ensure the overall connection of the ultraprecise rovibrational lines for both nuclear-spin isomers of H218O, the NICE-OHMS transitions are augmented with six accurate microwave lines taken from the literature. To produce absolute ortho-H218O energies, the lowest ortho energy is determined to be 23.754 904 61(19) cm−1. A reference, benchmark-quality line list of 1546 transitions, deduced from the ultrahigh-accuracy energy values determined in this study, provides calibration standards for future high-resolution spectroscopic experiments between 0–1250 and 5900–8380 cm−1.
DOI：
10.1016/j.jqsrt.2012.02.023
发表时间：
2012-07-01
影响因子：
2.3
作者：
Lodi, Lorenzo;Tennyson, Jonathan
通讯作者：
Tennyson, Jonathan
影响因子：
4.3
作者：
Furtenbacher, Tibor;Tobias, Roland;Csaszar, Attila G.
通讯作者：
Csaszar, Attila G.