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Long-range van der Waals forces between alkali clusters and atoms

J. Chem. Phys. 108, 6660 (1998); doi:10.1063/1.476081

Issue Date: 22 April 1998

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V. V. Kresin, G. Tikhonov, V. Kasperovich, K. Wong, and P. Brockhaus
University of Southern California, Department of Physics and Astronomy, Los Angeles California 90089-0484
We study the long-range attractive force between neutral sodium clusters Nan (2 <= n <= 20) and the alkali atoms Li, Na, and K. Absolute cross sections for the scattering of a beam of clusters by atomic vapor are measured, and are shown to arise from the van der Waals dispersive interaction V = –C6/r6. These cross sections are extremely large (up to thousands of Å2 in the center-of-mass frame). Their magnitudes are in good agreement with predictions based on the London theory of dispersion forces; the large strength of the interaction is a consequence of the high cluster polarizabilities. In addition, we evaluate the contribution of the higher-order potential term –C8/r8 to the scattering cross section and show that it can become quite significant for collisions involving large clusters (n ~ 102–103). ©1998 American Institute of Physics.
History: Received 16 December 1997; accepted 20 January 1998
Permalink: http://link.aip.org/link/?JCPSA6/108/6660/1
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KEYWORDS and PACS

Keywords
PACS
  • 36.40.-c
    Studies of special atoms, molecules, and their ions; clusters Atomic and molecular clusters
  • 34.20.Gj
    Atomic and molecular collision processes and interactions Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions Intermolecular and atommolecule potentials and forces
  • 34.50.-s
    Atomic and molecular collision processes and interactions Scattering of atoms, molecules, and ions
  • YEAR: 1998

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ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (37)
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