Exploring Lanthanide(III) Complexes

[e2718281]

I am studying the optical activity of the lanthanide(III) complexes.
In the ligand field model,
the ligand field hamiltonian operator is described in
the sum of the electrostatic interaction between
the l_A pole of the lanthanide³⁺ charge distribution
and the l_L pole of the Lth ligand charge distribution.

I think that l_A = 2, 4, and 6 represent electric dipole, quadrupole, and hexapole, respectively.
My question is what is the odd pole? magnetic dipole??

Regards,

 

[BigJDubs]

Yes, the odd pole is usually referred to as a magnetic dipole. This refers to the interaction between the lanthanide and the ligand's magnetic moments, which can affect the optical activity of the complex.