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where x is the effective (screened) charge of the ith electron, Vo is the depth of the radial potential, ri is the separation between the active electron and the ith electron and fi (f.) is a switching fbnction that turns on (off) the radial confining potential near the surface of the sphere. For the our purposes the screening of the fixed electrons will be neglected so that all the ^'s are set to 1, Vo is chosen to be 1.0 hartree. The total switching function (f,1 -ยก2) takes the form:

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