Laboratory rotational spectroscopy of the magnesium-carbon chains MgC4H and MgC3N

IF 1.4 4区 物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Journal of Molecular Spectroscopy Pub Date : 2024-03-01 DOI:10.1016/j.jms.2024.111904
P. Bryan Changala , Nadav Genossar-Dan , Joshua H. Baraban , Michael C. McCarthy
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Abstract

Recent advances in circumstellar metal chemistry and laser-coolable molecules have spurred interest in the spectroscopy and electronic properties of alkaline earth metal-bearing polyatomic molecules. We report the microwave rotational spectra of two members of this important chemical family, the linear magnesium-carbon chains MgC4H and MgC3N, detected with cavity Fourier transform microwave spectroscopy of a laser ablation-electric discharge expansion. The rotation, fine, and hyperfine parameters have been derived from the precise laboratory rest frequencies. These experimental results, combined with a theoretical quantum chemical analysis, confirm the recent identification of MgC4H and MgC3N in the circumstellar envelope of the evolved carbon-rich star IRC+10216. The spectroscopic data also provide insight into the structural and electronic properties that influence the metal-based optical cycling center in this unique class of laser-coolable polyatomics.

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镁碳链 MgC4H 和 MgC3N 的实验室旋转光谱分析
最近在星周金属化学和激光可冷却分子方面取得的进展激发了人们对含碱土金属多原子分子的光谱学和电子特性的兴趣。我们报告了这一重要化学家族的两个成员--线性镁碳链 MgC4H 和 MgC3N 的微波旋转光谱。旋转参数、精细参数和超细参数都是根据精确的实验室静止频率推导出来的。这些实验结果与理论量子化学分析相结合,证实了最近在富碳演化星 IRC+10216 的星周包层中发现的 MgC4H 和 MgC3N。光谱数据还让我们深入了解了影响这一类独特的激光可冷却多面体中金属基光学循环中心的结构和电子特性。
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来源期刊
CiteScore
2.70
自引率
21.40%
发文量
94
审稿时长
29 days
期刊介绍: The Journal of Molecular Spectroscopy presents experimental and theoretical articles on all subjects relevant to molecular spectroscopy and its modern applications. An international medium for the publication of some of the most significant research in the field, the Journal of Molecular Spectroscopy is an invaluable resource for astrophysicists, chemists, physicists, engineers, and others involved in molecular spectroscopy research and practice.
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