:term:`CFOUR_DBOC <CFOUR_DBOC (CFOUR)>`
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      Specifies whether the diagonal Born-Oppenheimer correction (DBOC) to the energy is evaluated (ON =1) or not (OFF =0). DBOC calculations are currently only available for HF-SCF and CCSD using RHF or UHF reference functions.

      * **Type**: :ref:`boolean <op_c_boolean>`
      * **Default**: false