part 1 a
Hamiltonian (multipolar charge moment)
The representations of CEF potentials (V) in the spherical coordination:
Pnm - Legendre functions,
Ynm - spherical harmonic functions,
Znm - tesseral harmonic.
The most elementary expressions of the elements of the multipolar series (in Cartesian co-ordination):
The examples of the visual presentation (in cartesian co-ordinate system) of the elements of the multipolar series Vnm.