:term:`PERTURB_WITH <PERTURB_WITH (SCF)>`
"""""""""""""""""""""""""""""""""""""""""

      The operator used to perturb the Hamiltonian, if requested

      * **Type**: string
      * **Possible Values**: DIPOLE\_X, DIPOLE\_Y, DIPOLE\_Z, EMBPOT, SPHERE, DX
      * **Default**: DIPOLE\_X