Photon absorption and electron scattering by endohedrals

TL;DR

This paper investigates how the fullerene shell influences photon absorption and electron scattering in endohedrals, revealing significant effects like resonances and minima through theoretical modeling and numerical analysis.

Contribution

It introduces a combined static and dynamic potential model to analyze the fullerene shell's impact on scattering cross-sections, incorporating electron correlations via RPAE.

Findings

Fullerenes shell significantly alters scattering cross-sections.

Identification of confinement and giant-endohedral resonances.

Observation of Ramsauer-type minima in partial waves.

Abstract

We concentrate here on photon absorption as well as electron and positron scattering upon endohedrals that consist of a fullerenes shell and an inner atom A. The aim is to understand the effect of fullerene electron shell in formation of corresponding cross-section. We consider the problem substituting the action of a complex multiatomic fullerenes shell by a combination of static pseudopotential and dynamic polarization potential. The electron correlations in the atom A are taken into account in the frame of the random phase approximation with exchange (RPAE). We demonstrate that the fullerenes shell strongly affects the cross-sections, bringing in a number of peculiarities, such as confinement resonances and giant-endohedral resonances and partial wave Ramsauer-type minima. Numerical data are obtained for endohedrals A@C60 and A@C60@C240, where A are noble gas atoms He, Ar and Xe.