Solvation of Na+, K+, and their dimers in helium.

Solvation of Na+, K+, and their dimers in helium.
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Na+,K+及其二聚体的溶剂化。

DOI:
10.1002/chem.201103432
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发表时间:
2012-04-02
影响因子:
4.3
通讯作者:
Scheier, Paul
Scheier, Paul
中科院分区:
化学2区
文献类型:
--
作者:
An der Lan, Lukas;Bartl, Peter;Leidlmair, Christian;Jochum, Roland;Denifl, Stephan;Echt, Olof;Scheier, Paul

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氦原子与碱性阳离子牢固结合,当嵌入液氦时,形成所谓的雪球。计算表明,这些雪球的第一溶剂化层中的氦原子形成刚性结构,并且它们的数量(n)是明确定义的,特别是对于较轻的碱金属。然而,迄今为止的实验未能准确确定 n 的值。我们展示了由掺杂氦液滴电子电离形成的 Na+Hen、K+Hen、Na2+Hen 和 K2+Hen 的高分辨率质谱;这些数据可以与一些理论研究进行批判性比较。对于钠和钾单体,光谱表明 n 值略小于计算值。 Na2+Hen 在 n=2 和 n=6 时表现出两种不同的异常,与理论一致;实验得出的解离能与理论值密切相关。 K2+Hen 分布相当无特征,这也与预测相符。
Helium atoms bind strongly to alkali cations which, when embedded in liquid helium, form so-called snowballs. Calculations suggest that helium atoms in the first solvation layer of these snowballs form rigid structures and that their number (n) is well defined, especially for the lighter alkalis. However, experiments have so far failed to accurately determine values of n. We present high-resolution mass spectra of Na+Hen, K+Hen, Na2+Hen and K2+Hen, formed by electron ionization of doped helium droplets; the data allow for a critical comparison with several theoretical studies. For sodium and potassium monomers the spectra indicate that the value of n is slightly smaller than calculated. Na2+Hen displays two distinct anomalies at n=2 and n=6, in agreement with theory; dissociation energies derived from experiment closely track theoretical values. K2+Hen distributions are fairly featureless, which also agrees with predictions.
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发表时间: 2009-01-01
影响因子: 4.3
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