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arXiv 2605.00564physics.chem-phastro-ph.GA
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高分辨率的转-振动和旋转光谱学研究线性开壳CCH$^+$离子($^3Π$)

High-resolution ro-vibrational and rotational spectroscopy of the open-shell, linear CCH$^+$ ion ($^3Π$)

HFML-FELIX(高场磁体中心-自由电子激光);Institute for Molecules and Materials(分子与材料研究所);Max Planck Institute for Extraterrestrial Physics(马克斯·普朗克地外物理研究所)

Kim Steenbakkers, Weslley G. D. P. Silva, Oskar Asvany, Gerrit C. Groenenboom, Pavol Jusko, Britta Redlich, Sandra Brünken, Stephan Schlemmer

AI总结:

本研究通过漏出光谱法获得了CCH$^+$($^3Π$)在3066-3184 cm$^{-1}$范围内的高分辨率红外光谱,确定了基态和两个振动激发态的精确光谱参数,并为天文观测提供了数据支持。

摘要:

在本工作中,我们报告了通过漏出光谱法记录的CCH$^+$($^3Π$)在3066-3184 cm$^{-1}$范围内的高分辨率红外光谱。该光谱范围覆盖了CH伸缩振动基态和高度激发的弯曲振动模式。基于这385条转-振动谱线数据,获得了CCH$^+$基态和两个振动激发态的精确光谱描述。除了能级起源外,还推导出了基态和激发振动态的自旋-轨道耦合常数、旋转常数、离心畸变常数和Λ-双倍常数。该有效哈密顿量分析使我们能够通过双色毫米波-红外方案搜索CCH$^+$在电子和振动基态下的纯旋转谱线。我们观察到了在Ω=2最低能量精细结构分量中,从J''=2到J''=6的所有旋转跃迁,并解析了超精细分裂。这些数据已经指导了向猎户座星云光解离区域的首次空间CCH$^+$探测,并有潜力通过射电或红外光谱学(例如詹姆斯·韦伯空间望远镜)进一步支持CCH$^+$的天文搜索。

英文摘要:

In this work, we report on the high-resolution infrared spectrum of CCH$^+$ ($^3Π$) recorded in the range $3066-3184$~cm$^{-1}$ by means of leak-out spectroscopy. This spectral range covers the fundamental of the CH stretching mode and a highly excited bending vibrational mode. Based on this data (385 ro-vibrational lines), accurate spectroscopic descriptions of the ground and the two vibrationally excited states of CCH$^+$ were obtained. Besides the band origins, spin-orbit coupling constants, rotational constants, centrifugal distortion constants and $Λ$-doubling constants for the ground and excited vibrational states have been derived. This effective Hamiltonian analysis allowed a search for pure rotational lines of CCH$^+$ in its electronic and vibrational ground state using a two-color millimeterwave - infrared scheme. We observed all rotational transitions from $J^{\prime\prime} = 2$ up to $J^{\prime\prime} = 6$ within the $Ω= 2$ lowest energy fine structure component with resolved hyperfine splittings. This data has already guided the first detection of CCH$^+$ in space toward the Orion Bar photo-dissociation region, and has the potential to support further astronomical searches for CCH$^+$ either through radio or infrared spectroscopy, for example with the James Webb Space Telescope.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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