Example: Analytic Frequencies: CN
*********************************

"Download CN_SecDeriv.run"

   #! /bin/sh


   # Calculation of normal modes is requested by specifying in the AMS input:
   # Properties
   #   NormalModes Yes
   # End
   # ADF will compute the Hessian analytically if possible.
   # If the Hessian cannot be computed analytically, numerical differentiation
   # will automatically be used.

   # A good quality is specified for the numerical Becke integration to be sure of
   # reliable results. In general, it seems advisable to use high accuracy for
   # heavy nuclei at the moment, whereas default integration accuracy is usually
   # sufficient for light atoms. The precision of the fit may be improved with the
   # ZlmFit block keyword.


   $AMSBIN/ams <<eor
   System
     Symmetrize
     atoms
        N  -1.3  0.0   0.0
        C   0.0  0.0   0.0
     end
     charge -1
   end

   Task SinglePoint

   Properties
     NormalModes Yes
   End

   Engine ADF
     title CN
     beckegrid
       quality good
     end
     basis
       type DZ
       core None
       CreateOutput Yes
     end
     xc
       lda Xonly
     end
   EndEngine

   eor
