Positron scattering and annihilation from the hydrogen molecule at zero energy
Abstract
The confined variational method is used to generate a basis of correlated gaussians to describe the interaction region wave function for positron scattering from the H2 molecule. The scattering length was ≈ -2.7 a0 while the zero energy Z eff of 15.7 is compatible with experimental values. The variation of the scattering length and Z eff with inter-nuclear distance was surprisingly rapid due to virtual state formation at R ≈ 3.4 a0.
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