Total electron ionization cross-sections for molecules of astrochemical interest

Total electron ionization cross-sections for molecules of astrochemical interest
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天体化学感兴趣的分子的总电子电离截面

DOI:
10.1080/00268976.2019.1583389
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发表时间:
2019
期刊:
影响因子:
1.7
通讯作者:
Zhou W
Zhou W
中科院分区:
化学4区
文献类型:
--
作者:
Zhou W

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我们描述了一种新升级的仪器,用于测量绝对总电子电离截面的能量范围从0到300 eV,目前的截面为9个以前未研究的分子,以及几个小分子的比较数据。测得的横截面与BEB模型的预测进行比较,并显示合理的协议与模型,虽然峰值在更高的电子能量比模型预测。我们发现,在截面的最大值遵循加和模型,这样的分子截面可以表示为一个总和超过贡献的组成原子。这些贡献已经确定从一个全球性的适合所有分子的研究数据,并允许最大的横截面预测的分子,迄今尚未研究。我们证明了预期的最大电离截面和分子极化率之间的相关性,并表明,原子的贡献的横截面上显示出类似的依赖于原子的极化率。所观察到的相关性可以用作预测未知最大截面的替代方法。
We describe a newly upgraded instrument for measuring absolute total electron ionization cross-sections over the energy range from 0 to 300 eV, and present cross-sections for nine previously unstudied molecules, as well as several small molecules for which comparison data is available. The measured cross-sections are compared with the predictions of the BEB model, and show reasonable agreement with the model, albeit peaking at higher electron energies than predicted by the model. We show that the maxima in the cross-sections follow an additivity model, such that the molecular cross-sections can be expressed as a sum over contributions from the constituent atoms. These contributions have been determined from a global fit to the data for all molecules studied, and allow maximum cross-sections to be predicted for molecules that have not been studied to date. We demonstrate the expected correlation between the maximum ionization cross-section and the molecular polarisability, and show that the atomic contributions to the cross-section show a similar dependence on the atomic polarisability. The observed correlation can be used as an alternative method for predicting unknown maximum cross-sections.
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