Example: HDA excitation energies: NH3
*************************************

"Download NH3_HDA.run"

   #!/bin/sh

   # Calculation of the excitation energies of NH3 using the
   # Hybrid Diagonal Approximation (HDA).
   # Relevant in case hybrid XC functionals are used.
   # For speed reasons one should set a (not so large) value for HDA_CutOff.

   AMS_JOBNAME=NH3 $AMSBIN/ams << eor
   System
     symmetrize
     atoms
        N   0.000000    0.000000    0.000000
        H   0.956305    0.000000    0.292372
        H  -0.478152    0.828184    0.292372
        H  -0.478152   -0.828184    0.292372
     end
   end

   Task SinglePoint

   Engine ADF
     Basis
       Type TZP
     End 

     XC
       Hybrid B3LYP
     End

     Excitations
       Allowed
       lowest 21
       HDA
       HDA_CutOff 40.0 [eV]
     End
   EndEngine
   eor
