The Born Oppenheimer wave function near level crossing

Details The Born Oppenheimer wave function near level crossing The Born Oppenheimer wave function near level crossing

2000-06-18

arxiv.org/abs/quant-ph/0006078v2

Physics

Quantum Physics

21 pages, 7 figures

Scientific paper

10.1103/PhysRevA.62.062504

The standard Born Oppenheimer theory does not give an accurate description of the wave function near points of level crossing. We give such a description near an isotropic conic crossing, for energies close to the crossing energy. This leads to the study of two coupled second order ordinary differential equations whose solution is described in terms of the generalized hypergeometric functions of the kind 0F3(;a,b,c;z). We find that, at low angular momenta, the mixing due to crossing is surprisingly large, scaling like \mu^(1/6), where \mu is the electron to nuclear mass ratio.

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