Electron-Driven Self-Assembly of Salt Nanocrystals in Liquid Helium

The self‐assembly of salt nanocrystals from chemical reactions inside liquid helium is reported for the first time. Reaction is initiated by an electron impacting a helium nanodroplet containing sodium atoms and SF6 molecules, leading to preferential production of energetically favorable structures...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2014-12, Vol.53 (49), p.13528-13531
Main Authors: Daxner, Matthias, Denifl, Stephan, Scheier, Paul, Ellis, Andrew M.
Format: Article
Language:English
Subjects:
Anions
Communications
Droplets
electron transfer
Helium
helium nanodroplets
Liquid helium
Mass spectra
Mass spectrometry
Mass spectroscopy
Nanostructure
salt nanocrystals
Self assembly
Sodium
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Summary:The self‐assembly of salt nanocrystals from chemical reactions inside liquid helium is reported for the first time. Reaction is initiated by an electron impacting a helium nanodroplet containing sodium atoms and SF6 molecules, leading to preferential production of energetically favorable structures based on the unit cell of crystalline NaF. These favorable structures are observed as magic number ions (anomalously intense peaks) in mass spectra and are seen in both cationic and anionic channels in mass spectra, for example, (NaF)nNa+ and (NaF)nF−. In the case of anions the self‐assembly is not directly initiated by electrons: the dominant process involves resonant electron‐induced production of metastable electronically excited He− anions, which then initiate anionic chemistry by electron transfer. Salting droplets: Electrons are used to initiate reaction between SF6 and sodium clusters inside helium nanodroplets. The resulting NaF products self‐assemble into crystalline salt structures.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201409465