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arXiv 2402.00733physics.chem-ph
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H$_2$CCCH$^+$的高分辨率振转光谱与纯转动光谱

High Resolution Rovibrational and Rotational Spectroscopy of H$_2$CCCH$^+$

Weslley Guilherme Dias de Paiva Silva, Divita Gupta, Eline Plaar, José Luis Doménech, Stephan Schlemmer, Oskar Asvany

AI总结:

本研究通过低温离子阱泄漏光谱法结合量子化学计算,获得H$_2$CCCH$^+$的振转光谱并预测基态转动结构,测量14条纯转动跃迁,为该分子离子的星际射电探测提供了关键数据支撑。

摘要:

本研究在4K低温离子阱装置中采用泄漏光谱法,对分子离子H$_2$CCCH$^+$的振转光谱开展了研究。借助高水平量子化学计算辅助搜索,检测到了基频$ν_1$(C-H伸缩振动)和组合频带$ν_3$+$ν_5$(C-C伸缩振动)内的跃迁。通过对振转测量结果的分析,我们得以预测基态的转动结构。利用振转双共振方案,测量了14条纯转动跃迁。这一成果进而促成了H$_2$CCCH$^+$在星际介质中的射电天文探测,相关结果近期已发表(Silva等人,《Astron. Astrophys.》第676卷,L1页,2023年)。

英文摘要:

The rovibrational spectrum of the molecular ion H$_2$CCCH$^+$ was investigated in a 4~K cryogenic ion trap instrument employing the leak-out spectroscopy method. Transitions within the fundamental $ν_1$ (C-H stretch) and the combination band $ν_3$+$ν_5$ (C-C stretches) were detected, the search aided by high level quantum chemical calculations. The analysis of the rovibrational measurements enabled us to predict the rotational structure of the ground state. Using a rotational-vibrational double-resonance scheme, 14 pure rotational transitions were measured. This, in turn, led to the radio astronomical detection of H$_2$CCCH$^+$ in the interstellar medium, as recently reported (Silva et al., Astron. Astrophys. 676, L1, 2023).

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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