Positron scattering and annihilation from the hydrogen molecule at zero energy

Details Positron scattering and annihilation from the hydrogen molecule at zero energy Positron scattering and annihilation from the hydrogen molecule at zero energy

2009-11-23

arxiv.org/abs/0911.4315v1

Physics

Computational Physics

Scientific paper

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 H$_2$ molecule. The scattering length was $\approx -2.7$ $a_0$ while the zero energy $Z_{\rm eff}$ of 15.7 is compatible with experimental values. The variation of the scattering length and $Z_{\rm eff}$ with inter-nuclear distance was surprisingly rapid due to virtual state formation at $R \approx 3.4$ $a_0$.

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