A Network Approach for the Accurate Characterization of Water Lines Observable in Astronomical Masers and Extragalactic Environments

IF 2.9 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY ACS Earth and Space Chemistry Pub Date : 2024-08-09 DOI:10.1021/acsearthspacechem.4c0016110.1021/acsearthspacechem.4c00161

Wim Ubachs*, Attila G. Császár, Meissa L. Diouf, Frank M. J. Cozijn and Roland Tóbiás*,

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Abstract

The water molecule, crucial to the chemical composition and dynamics of the universe, is typically identified in its gas phase via radio and submillimeter transitions, with frequencies up to a few THz. To understand the physicochemical behavior of astronomical objects, accurate transition frequencies are required for these lines. From a set of 26 new and 564 previous Lamb dip measurements, utilizing our ultrasensitive laser-based spectrometers in the near-infrared region, ultrahigh-precision spectroscopic networks were set up for H₂¹⁶O and H₂¹⁸O, augmented with 40 extremely accurate frequencies taken from the literature. Based on kHz-accuracy paths of these networks, considerably improved line-center frequencies have been obtained for 35 observed or predicted maser lines of H₂¹⁶O, as well as for 14 transitions of astronomical significance of H₂¹⁸O. These reference frequencies, attached with 5–25 kHz uncertainties, may help future studies in various fields of astrochemistry and astrophysics, in particular when precise information is demanded about Doppler-velocity components, including the gas flows of galactic cores, the kinematics of planetary nebulae, or the motion in exoplanetary atmospheres.

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准确描述天文增量器和银河系外环境中可观测到的水线的网络方法

水分子对宇宙的化学组成和动力学至关重要，通常是通过频率高达几 THz 的射电和亚毫米波跃迁来识别其气相。要了解天体的物理化学行为，就需要这些线的精确转换频率。利用我们基于激光的超灵敏近红外光谱仪，从一组 26 个新的和以前的 564 个 Lamb dip 测量结果中，为 H216O 和 H218O 建立了超高精度光谱网络，并增加了从文献中获取的 40 个极其精确的频率。根据这些网络的千赫兹精度路径，为 H216O 的 35 条观测到或预测到的 maser 线以及 H218O 的 14 个具有天文意义的跃迁获得了大幅改进的线中心频率。这些参考频率附有 5-25 千赫的不确定性，可能有助于今后在天体化学和天体物理学的各个领域进行研究，特别是在需要有关多普勒速度成分的精确信息时，包括银河系核心的气体流、行星状星云的运动学或系外行星大气中的运动。

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来源期刊

ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

5.30

自引率

11.80%

发文量

249

期刊介绍： The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.