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Suppressing the fragmentation of fragile molecules in helium nanodroplets by coembedding with water: Possible role of the electric dipole moment

J. Chem. Phys. 128, 074303 (2008); doi:10.1063/1.2839602

Published 20 February 2008

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Yanfei Ren and Vitaly V. Kresin
Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
When fragile molecules such as glycine, polyglycine, alkanes, and alkanethiols are embedded in liquid helium nanodroplets, electron-impact ionization of the beam leads to fragmentation which is as extensive as that of isolated gas-phase molecules. However, it turns out that if a few molecules of water are coembedded with the peptide and alkane chains, their fragmentation is drastically reduced or completely eliminated. On the other hand, the fragmentation of alkanethiols remains unaffected. On the basis of these observations, it is proposed that the fragmentation “buffering” effect may correlate with the magnitude of the impurity's electric dipole moment, which steers the migration of the ionizing He+ hole in the droplet. ©2008 American Institute of Physics
History: Received 20 November 2007; accepted 10 January 2008; published 20 February 2008
Permalink: http://link.aip.org/link/?JCPSA6/128/074303/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.15.Kr
    Molecular electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility
  • 34.80.Ht
    Dissociation and dissociative attachment by electron/positron impact (atoms and molecules)
  • 34.80.Gs
    Molecular excitation and ionization by electron/positron impact
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (27)
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