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Spherical harmonic multipole moments in terms of dipole density Ji
| Dipole |
| a10 = ∫ d3 r′ Jiz (r′) |
| a11 = ∫ d3 r′ Jix (r′) |
| a11 = ∫ d3 r′ Jiy (r′) |
| Quadrupole |
| a20 = ∫ d3 r′ [3z′ Jiz (r′) − r′ · Ji(r′)] |
| a21 = ∫ d3 r′ [x′ Jiz (r′) + z′ Jix(r′)] |
| b21 = ∫ d3 r′ [y′ Jiz (r′) + z′ Jiy(r′)] |
| 2a22 = ∫ d3 r′ [x′ Jix (r′) − y′ Jiy(r′)] |
| 2b22 = ∫ d3 r′ [x′ Jiy (r′) + y′ Jix(r′)] |
