Trends in near-threshold photoionization of off-the-center endohedral atoms

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Calculations of the photoelectron angular distribution from atoms confined in a fullerene cage have been performed using a recently developed theory of inner-shell near-threshold molecular photoionization. Trends uncovered in the modification of near-threshold photoelectron angular distribution of the [Formula Presented] molecules as a function of the displacement of the confined atom from the center of the [Formula Presented] cage are demonstrated. Specific results for Li [Formula Presented] from [Formula Presented] and Ar [Formula Presented] [Formula Presented] and [Formula Presented] from [Formula Presented] molecules are presented. In addition, the situation where the encapsulated atom lies in the vicinity of the center of one of the carbon hexagons of [Formula Presented] and also when it is displaced beyond the fullerene cage, has been studied. It has been found that the photoelectron spectra are extremely sensitive, both qualitatively and quantitatively, to even a small displacement of the confined atom from the center of the cage. The existence of the [Formula Presented] molecule even affects the atom’s photoelectron angular distribution when it is a significant distance away. © 2003 The American Physical Society.

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Physical Review A - Atomic, Molecular, and Optical Physics

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