Virtual and bound states in low-energy positron scattering by atoms and molecules via modified effective range theory
Kamil Fedus,
Grzegorz Karwasz
Abstract:Modified effective range theory is applied as a tool to determine bound and virtual state energies in low-energy positron elastic scattering by atoms and molecules. This is achieved by the S-matrix continuation into the complex momentum plane, allowing to identify poles related to shallow energy states. The influence of the long-range polarization potential (~r^-4) on the bound and virtual-state pole positions is analyzed for noble gases and nonpolar molecules such as H2, N2, and CH4. The quantitative relation… Show more
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