High precision measurement of the 3P0 - 3P1 atomic oxygen fine structure splitting at 2.06 THz

IF 2.3 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-04-23 DOI:10.1016/j.jqsrt.2025.109471

B.J. Drouin, D.J. Nemchick, A. Maestrini

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引用次数: 0

Abstract

Observation of the atomic oxygen fine structure line at 2.06 Terahertz from an orbiting limb sounder serves as a compelling platform for the characterization of neutral winds in the lower thermosphere and ionosphere (LTI,

\sim

110–250 km). The precision of wind measurements retrieved from this prospective instrument class are directly linked to the rest frequency of this targeted transition as determined from laboratory measurements. This effort details recent work at the Jet Propulsion Laboratory to deploy a custom designed transmitter and heterodyne receiver pair optimized for performance at 2.06 THz for use in obtaining high-precision rest frequencies for the oxygen atom

^{3}

_{0}

^{3}

_{1}

atomic fine structure splitting. Oxygen atom (¹⁶O) is generated by an inductively coupled plasma system with direct absorption measurements obtained by a combined frequency and plasma modulated experimental scheme. Results are discussed in the context of previous laboratory measurements and the impact on prospective neutral wind measurements in the LTI.

Abstract Image

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3P0 - 3P1原子氧精细结构在2.06 THz下分裂的高精度测量

在2.06太赫兹轨道上对原子氧精细结构线的观测为表征低层热层和电离层（LTI, ~ 110-250 km）的中性风提供了一个令人信服的平台。从这类仪器中获得的风测量精度与从实验室测量确定的目标转换的剩余频率直接相关。这项工作详细介绍了喷气推进实验室最近的工作，部署了一个定制设计的发射机和外差接收器对，优化了2.06太赫兹的性能，用于获得氧原子3P0 - 3P1原子精细结构分裂的高精度休息频率。氧原子（16O）由电感耦合等离子体系统产生，通过频率和等离子体调制组合实验方案获得直接吸收测量。结果在之前的实验室测量和对LTI预期中性风测量的影响的背景下进行了讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Quantitative Spectroscopy & Radiative Transfer 物理-光谱学

CiteScore

5.30

自引率

21.70%

发文量

273

审稿时长

58 days

期刊介绍： Papers with the following subject areas are suitable for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer: - Theoretical and experimental aspects of the spectra of atoms, molecules, ions, and plasmas. - Spectral lineshape studies including models and computational algorithms. - Atmospheric spectroscopy. - Theoretical and experimental aspects of light scattering. - Application of light scattering in particle characterization and remote sensing. - Application of light scattering in biological sciences and medicine. - Radiative transfer in absorbing, emitting, and scattering media. - Radiative transfer in stochastic media.