icf1ion - Intermediate Crystal Field module

In addition to the full ic1ion module, there is a derived module, icf1ion, in which only the lowest energy term of constant $L$ and $S$ is considered. Thus, the Coulomb interaction (see next section) is supposed to have such high energy that the low temperature physical properties may be accounted for just by the spin-orbit, crystal field, and exchange interactions. As a smaller energy matrix is required in this module, calculations will be faster. In the cases of a single outer shell electron or hole (e.g. Ce$^{3+}$ or Yb$^{3+}$), the two modules are identical. icf1ion accepts the same inputs as ic1ion, except that the Slater integrals $F^k$ are ignored.

Currently, the beyond dipole part of mcdisp is not yet implemented, as are the calculations of the spin and orbital moment densities. All other packages may use icf1ion.