Cusp conditions are obtained for the coalescence of any number of particles interacting Coulombically. This is an extension of the results of Hoffmann-Ostenhof and Seiler for atoms and molecules in the infinite-nuclear-mass approximation in two aspects: (1) the center of mass is first removed, and (2) the masses and charges are all allowed to differ.
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Bruce R. Johnson (1981) studied this question.
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