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MO: Molekülphysik
MO 7: Posters Wednesday: Theory: Structure and Dynamics
MO 7.11: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT3
Approach to Electron Translation in Low-Energy Collisions — •Andrey Belyaev1,2 and Joachim Grosser3 — 1Dept. of Theor. Physics, A.I.Herzen University, St. Petersburg 197181 Russia — 2Max-Planck-Institute for Quantum Optics, 85748 Garching, Germany — 3Inst. for At. and Mol. Physics, University of Hannover, 30167 Hannover, Germany
Inelastic atomic collisions at low energies
are of both fundamental and practical importance.
The most widely used approach for cross section calculations
is based on the standard adiabatic approximation. However, within this
approximation the nuclear dynamics treatment encounters a severe
difficulty.
The matrix elements coupling different electronic states
can remain nonzero at large internuclear distance.
The occurence of nonvanishing asymptotic couplings reflects a
less obvious but more fundamental shortcoming. The coordinates used
in the standard adiabatic approximation are not suited for the description
of the free atoms, and the corresponding representation of the
asymptotic wave function appears to be incorrect.
We present a new approach to the electron translation problem at low-energy
collisions in the framework of a full quantum mechanical treatment.
It applies to radial [1] as well as rotational coupling mechanisms.
References:
1. J.Grosser, T.Menzel, and A.K.Belyaev. Phys. Rev. A 59, 1309
(1999).