Including Quadrupolar and Higher Order Interactions

Some modules such as *so1ion*
allow also to calculate systems with higher order interactions such
as quadrupolar interactions. Quadrupolar and higher order interactions can be calculated, which
can be described by products of Stevens operators. The general two ion exchange coupling is

For further information on the notation and symmetry restrictions to the parameters in the Hamiltonian refer to [1].

- Setting up
*mcphas.j*and other input files - Option
*indexexchange*in order to shorten notation in*mcphas.j* - Running
*McPhase*and*McDisp*

Martin Rotter 2017-01-10