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Photoelectron spectroscopy of the [glycine·(H2O)1,2]– clusters: Sequential hydration shifts and observation of isomers

J. Chem. Phys. 122, 224317 (2005); doi:10.1063/1.1930833

Published 15 June 2005

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Eric G. Diken, Jeffrey M. Headrick, and Mark A. Johnson
Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520
The electron binding energies of the small hydrated amino acid anions, [glycine·(H2O)1,2]–, are determined using photoelectron spectroscopy. The vertical electron detachment energies (VDEs) are found to increase by approximately 0.12 eV with each additional water molecule such that the higher electron binding isomer of the dihydrate is rather robust, with a VDE value of 0.33 eV. A weak binding isomer of the dihydrate is also recovered, however, with a VDE value (0.14 eV) lower than that of the monohydrate. Unlike the situation in the smaller (n<=13) water cluster anions, the [Gly·(H2O)n>=6]– clusters are observed to photodissociate via water monomer evaporation upon photoexcitation in the O–H stretching region. We discuss this observation in the context of the mechanism responsible for the previously observed [S. Xu, M. Nilles, and K. H. Bowen, Jr., J. Chem. Phys. 119, 10696 (2003)] sudden onset in the cluster formation at [Gly·(H2O)5]–. ©2005 American Institute of Physics
History: Received 1 December 2004; accepted 20 April 2005; published 15 June 2005
Permalink: http://link.aip.org/link/?JCPSA6/122/224317/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.60.-q
    Photoelectron spectra of molecules
  • 36.40.Mr
    Spectroscopy and geometrical structure of atomic and molecular clusters
  • 33.80.Eh
    Autoionization, photoionization, and photodetachment of molecules
  • 33.15.Bh
    General molecular conformation and symmetry; stereochemistry
  • 33.15.Ry
    Molecular ionization potentials, electron affinities, molecular core binding energy
  • 33.80.Gj
    Diffuse molecular spectra; predissociation, photodissociation
  • 82.30.Nr
    Association, addition, insertion, cluster formation (chemical reactions)
  • YEAR: 2005

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PUBLICATION DATA

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