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Orientation of dipole molecules and clusters upon adiabatic entry into an external field

J. Chem. Phys. 129, 024101 (2008); doi:10.1063/1.2946712

Published 8 July 2008

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J. Bulthuis,1 J. A. Becker,2 R. Moro,3 and V. V. Kresin4
1Department of Physical Chemistry and Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
2Institut für Physikalische Chemie, Universität Hannover, D-30167 Hannover, Germany
3Department of Physical Sciences, Cameron University, Lawton, Oklahoma 73505, USA
4Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
The induced polarization of a beam of polar clusters or molecules passing through an electric or magnetic field region differs from the textbook Langevin–Debye susceptibility. This distinction, which is important for the interpretation of deflection and focusing experiments, arises because instead of acquiring thermal equilibrium in the field region, the beam ensemble typically enters the field adiabatically, i.e., with a previously fixed distribution of rotational states. We discuss the orientation of rigid symmetric top systems with a body-fixed electric or magnetic dipole moment. The analytical expression for their “adiabatic-entry” orientation is elucidated and compared with exact numerical results for a range of parameters. The differences between the polarization of thermodynamic and “adiabatic-entry” ensembles of prolate and oblate tops, and of symmetric top and linear rotators, are illustrated and identified. ©2008 American Institute of Physics
History: Received 6 May 2008; accepted 27 May 2008; published 8 July 2008
Permalink: http://link.aip.org/link/?JCPSA6/129/024101/1
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KEYWORDS and PACS

Keywords
PACS
  • 36.40.Sx
    Diffusion and dynamics of atomic and molecular clusters
  • 33.15.Kr
    Molecular electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility
  • 33.15.Hp
    Molecular barrier heights (internal rotation, inversion, rotational isomerism, conformational dynamics)
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (43)
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