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Anionic hydrogen cluster ions as a new form of condensed hydrogen

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journal contribution
posted on 17.11.2016, 11:07 by M. Renzler, M. Kuhn, A. Mauracher, A. Lindinger, P. Scheier, Andrew M. Ellis
We report the first experimental observation of negatively charged hydrogen and deuterium cluster ions, Hn- and Dn-, where n >= 5. These anions were formed by electron addition to liquid helium nanodroplets doped with molecular hydrogen or deuterium. The ions were stable for at least the lifetime of the experiment, which is several tens of microseconds. Only anions with odd values of n were detected and some specific ions showed anomalously high abundances. The sizes of these ‘magic number’ ions suggest an icosahedral framework of H2 (D2) molecules in solvent shells around a central H-(D-) ion. The first three shells, which contain a total of 44 H2 or D2 molecules, appear to be solid-like but thereafter a more liquidlike arrangement of the H2 (D2) molecules is adopted.

Funding

This work was given financial support by the Austrian Science Fund (FWF) Wien (P26635 and I978).

History

Citation

Physical Review Letters, 2016, 117, 273001

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

VoR (Version of Record)

Published in

Physical Review Letters

Publisher

American Physical Society

issn

0031-9007

eissn

1079-7114

Acceptance date

17/11/2016

Copyright date

2016

Available date

14/03/2017

Publisher version

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.273001

Language

en

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