An update to the MARVEL data set and ExoMol line list for 12C2
An update to the MARVEL data set and ExoMol line list for 12C2
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MARVEL 数据集和 12C2 的 ExoMol 线路列表的更新
DOI：
10.1093/mnras/staa1954
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发表时间：
2020
影响因子：
4.8
通讯作者：
A. Császár
中科院分区：
文献类型：
--
作者：
Laura K. McKemmish;Anna;Jasmin Borsovszky;S. Yurchenko;J. Tennyson;T. Furtenbacher;A. Császár
二碳原子（C2）的光谱在天体物理学以及等离子体和火焰的光谱研究中具有重要意义。C2光谱的特点是有许多波段系统，新的波段系统仍在积极识别中;天文观测涉及其中的八个波段。最近，Furtenbacher等人提出了一组12 C2的5699个经验能级，分布在11个电子态和98个振动带中，来自42个实验研究，并使用MARVEL（测量的主动旋转振动能级）程序获得。
在这里，我们添加了来自13个新来源的数据，并更新了来自5个来源的数据。许多这些数据源的特点高躺电子状态，包括新检测到的3 3 μ g状态。在MARVEL程序改进后，纳入了较早的研究，以估计其不确定性。这些较老的工作，特别是确定在C 1 g状态，不充分的特点Deslandres-d 'Azambuja（C 1 g-A 1 u）带的上部状态的水平。
新的汇编考虑了总共31323个跃迁，并推导出7047个经验（奇迹）能级，跨越20个电子和142个振动态。这些新的经验能级在这里用于更新8状态C2 ExoMol线列表。这个更新的线表非常适合于天文光谱学中的高分辨率互相关研究，例如系外行星，因为在1000 K时强度超过10−18 cm molecule−1的跃迁中，99.4%的频率由经验能级确定。
The spectrum of dicarbon (C2) is important in astrophysics and for spectroscopic studies of plasmas and flames. The C2 spectrum is characterized by many band systems with new ones still being actively identified; astronomical observations involve eight of these bands. Recently, Furtenbacher et al. presented a set of 5699 empirical energy levels for 12C2, distributed among 11 electronic states and 98 vibronic bands, derived from 42 experimental studies and obtained using the MARVEL (Measured Active Rotational-Vibrational Energy Levels) procedure.
Here, we add data from 13 new sources and update data from 5 sources. Many of these data sources characterize high-lying electronic states, including the newly detected 3 3Πg state. Older studies have been included following improvements in the MARVEL procedure that allow their uncertainties to be estimated. These older works in particular determine levels in the C 1Πg state, the upper state of the insufficiently characterized Deslandres–d’Azambuja (C 1Πg–A 1Πu) band.
The new compilation considers a total of 31 323 transitions and derives 7047 empirical (marvel) energy levels spanning 20 electronic and 142 vibronic states. These new empirical energy levels are used here to update the 8states C2 ExoMol line list. This updated line list is highly suitable for high-resolution cross-correlation studies in astronomical spectroscopy of, for example, exoplanets, as 99.4 per cent of the transitions with intensities over 10−18 cm molecule−1 at 1000 K have frequencies determined by empirical energy levels.