Cationic complexes of hydrogen with helium.

Cationic complexes of hydrogen with helium.
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DOI:
10.1002/cphc.201200664
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发表时间:
2013-01-14
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
Echt O
Echt O
中科院分区:
其他
文献类型:
--
作者:
Bartl P;Leidlmair C;Denifl S;Scheier P;Echt O

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掺杂氢或氘的氦纳米液滴的高分辨率质谱表明,大量的氦可以与 H+、H2+、H3+ 和较大的氢簇离子结合。如果所有可能的 HenHx+ 化学计量的质量低于光谱仪分辨率设定的 ≍120 u 限值,则它们都会被识别。当 x=1、2 或 3 且 n≤30 时,HenHx+ 离子产率的异常表明簇离子特别稳定。我们对 HenH1+ 的结果与之前仅限于较小簇离子的实验和理论研究得出的结论一致。 HenH3+ 系列在 n=12 时表现出明显的异常,超出了早期实验的可靠范围。与其他双原子掺杂剂分子的研究结果相反,单体离子(即 H2+)保留氦气的效率比氢簇离子高得多。
High-resolution mass spectra of helium nanodroplets doped with hydrogen or deuterium reveal that copious amounts of helium can be bound to H+, H2+, H3+, and larger hydrogen-cluster ions. All conceivable HenHx+ stoichiometries are identified if their mass is below the limit of ≍120 u set by the resolution of the spectrometer. Anomalies in the ion yields of HenHx+ for x=1, 2, or 3, and n≤30 reveal particularly stable cluster ions. Our results for HenH1+ are consistent with conclusions drawn from previous experimental and theoretical studies which were limited to smaller cluster ions. The HenH3+ series exhibits a pronounced anomaly at n=12 which was outside the reliable range of earlier experiments. Contrary to findings reported for other diatomic dopant molecules, the monomer ion (i.e. H2+) retains helium with much greater efficiency than hydrogen-cluster ions.
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