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** Up:** 38.5 Finite field calculations
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38.5.3 General fields (`FIELD`)

`FIELD`,*oper1,fac1, oper2,fac2, ...*;

`FIELD+`,*oper1,fac1, oper2,fac2, ...*;

Adds one-electron operators *oper1*, *oper2*, ...with the corresponding
factors *fac1*, *fac2*, ...to the one-electron hamiltonian.
The available operators are given in section 6.13.
An error will result if the added perturbation is not
totally symmetric (symmetry 1).

`FIELD+` adds to any existing field, otherwise any previous field is
removed.

Note that `FIELD` does currently not modify core polarization potentials (CPP).
If CPPs are present, only `DIP` and `QUAD` should be used.

molpro@molpro.net 2017-12-15