Abstract
Results of a theoretical study of photoionization cross sections and photoelectron angular distribution asymmetry parameters of an atom A confined in spherical multi-walled buckyonions are presented and compared with those obtained for the free atom A as well as for A confined in giant spherical single-walled buckyballs Cn≥240. Each individual nested buckyball cage is represented by a spherical, short-range, attractive potential characterized by the inner radius, width, and potential depth. Trends in the strength and location of confinement resonances in the photoionization spectra, as a function of the number of nested buckyballs, are delineated. As examples, calculations of the 1s photoionization of Ar confined in A@C60, A@C240, Ar@C540, A@C60@C240, and A@C60@C240@C540 are presented. The calculations are performed within the framework of a Hartree-Fock approximation which is appropriate for a deep inner-shell photoionization. The trends seen should be a general occurrence for an inner-shell photoionization of virtually any atom confined in spherical buckyballs or buckyonions, not only Ar.
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