https://doi.org/10.1007/s100530050280
Advanced adiabatic approximation for momentum distributions of ejected electrons in slow atomic collisions
1
Institute of Physics, P.O. Box 57, 11001 Belgrade, Yugoslavia
2
The Macedonian Academy of Sciences and Arts, P.O. Box 428,
91000 Skopje, Macedonia
Received:
5
October
1998
Published online: 15 April 1999
The problem of determination of momentum distributions of ejected
electrons in slow atomic collisions is studied within the impact-parameter
method by using a dynamic adiabatic basis which takes into account the
correct boundary conditions.
An expression is obtained
which relates the momentum distribution of the ejected electrons with a
coherent sum of the delocalized dynamic adiabatic
eigenstates (elementary wavepackets).
The form of the momentum distribution exactly coincides
with the form of the total wavepacket in configuration space.
General formulas are applied to a model problem of electron detachment in
the process 
in which the electron-atom
interactions are described by the zero-range potentials.
In the example considered, the momentum
distribution of ejected electrons, in the center-of-mass frame, exhibits a
maximum located in the scattering plane on the circle of
radius 
(in atomic units), where v is
the relative collision velocity
and ρ is the impact parameter.
PACS: 34.10.+x – General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
