grimmedisp
===========

This option defines how to apply Grimme dispersion correction version 3, i.e. DFT-D3.

When there is no ``grimmedisp`` in the input file, no DFT-D3 will be applied.

.. option:: type

   .. list-table::
      :stub-columns: 1
      :widths: 5 20
   
      * - Value
        - ``bj`` Becke-Johnson DFT-D3 form
      * - 
        - ``zero`` Zero-damp DFT-D3 form
      * - Default
        - None
      
   Define form of DFT-D3. There is no default value and you must assign ``bj`` or ``zero``. 
   
   In most cases, ``bj`` is better, but for some functionals, like M06, M062X, and M06HF, only ``zero`` is available.

.. option:: three_body
   
   Add three body corrections in DFT-D3. This is useful for large systems.

.. option:: tz
   
   If triple zeta basis sets are used, this keyword may bring some improvement.