 04192 George A. Hagedorn, Alain Joye
 Determination of NonAdiabatic Scattering Wave Functions in a BornOppenheimer Model
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Jun 21, 04

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Abstract. We study nonadiabatic transitions in scattering theory for the time dependent molecular Schroedinger equation in the BornOppenheimer limit. We assume the electron Hamiltonian has finitely many levels and consider the propagation of coherent states
with high enough total energy.
When two of the electronic levels are isolated from the rest of the electron Hamiltonian's spectrum and display an avoided crossing, we compute the component of the nuclear wave function associated with the nonadiabatic transition that is generated by propagation through the avoided crossing. This component is shown to be exponentially small in the square of the BornOppenheimer parameter, due to the LandauZener mechanism. It propagates asymptotically as a free Gaussian in the nuclear variables, and its momentum is shifted. The total transition probability for this transition and the momentum shift are both larger than what one would expect from a naive approximation and energy conservation.
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