Electron‐Driven Self‐Assembly of Salt Nanocrystals in Liquid Helium1. (6th November 2014)

• Record Type: Journal Article
• Authors: Daxner, Matthias; Denifl, Stephan; Scheier, Paul; Ellis, Andrew M.
• Is Part Of: Angewandte Chemie. Volume 126:Number 49(2014)
• Page Start: 13746
• Page End: 13749
• Publication Date: 2014-11-06
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201409465
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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)_{<italic>n</italic>}Na⁺ and (NaF)_{<italic>n</italic>}F⁻. 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.</p> </abstract>