Photoionization of atoms confined in giant single-walled and multiwalled fullerenes

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Results of a theoretical study of photoionization cross sections and photoelectron angular distribution asymmetry parameters of an atom A confined in spherical multiwalled fullerenes are presented and compared with those obtained for the free atom A as well as for A confined in giant spherical single-walled fullerenes Cn≥240. Each individual nested fullerene 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 fullerenes, are delineated. As examples, calculations of the 1s photoionization of Ar confined in C60, C240, C540, C60 @ C240, and 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 fullerenes not only Ar. © 2008 The American Physical Society.

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Physical Review A - Atomic, Molecular, and Optical Physics

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