E. Leykoo et A. Gongora, HARMONIC EXPANSIONS OF COULOMB POTENTIAL IN CYLINDRICAL, PARABOLIC AND SPHEROIDAL COORDINATES, Revista Mexicana de Fisica, 39(5), 1993, pp. 785-798
We construct the harmonic expansions of Coulomb's potential in circula
r cylindrical, parabolic, and both prolate and oblate spheroidal coord
inates, as alternatives to the well-known multipolar expansion in sphe
rical coordinates. These expansions are useful and necessary in the st
udy of physical systems possessing symmetries and satisfying boundary
conditions associated with the geometries of the respective coordinate
s.