Example: using amber or tripos

Download 2h2o.run

#! /bin/sh

AMS_JOBNAME=amber95 $AMSBIN/ams << eor

Task SinglePoint

System
  Atoms
       O      0.0000     0.0000     0.0000      ForceField.Type=OW         ForceField.Charge=-0.8340
       H     -0.5220     0.2660    -0.7570      ForceField.Type=HW         ForceField.Charge=0.4170
       H     -0.5220     0.2660     0.7570      ForceField.Type=HW         ForceField.Charge=0.4170
       O      0.0000    -3.2000     0.0000      ForceField.Type=OW         ForceField.Charge=-0.8340
       H      0.0570    -2.2440     0.0000      ForceField.Type=HW         ForceField.Charge=0.4170
       H      0.9110    -3.4950     0.0000      ForceField.Type=HW         ForceField.Charge=0.4170
  End
  BondOrders
        1  2  1.0
        1  3  1.0
        4  5  1.0
        4  6  1.0
  End
End

Engine ForceField
  Type Amber95
EndEngine
eor


AMS_JOBNAME=tripos5.2 $AMSBIN/ams << eor

Task SinglePoint

System
  Atoms
       O      0.0000     0.0000     0.0000      ForceField.Type=O.3       ForceField.Charge=-0.8340
       H     -0.5220     0.2660    -0.7570      ForceField.Type=H         ForceField.Charge=0.4170
       H     -0.5220     0.2660     0.7570      ForceField.Type=H         ForceField.Charge=0.4170
       O      0.0000    -3.2000     0.0000      ForceField.Type=O.3       ForceField.Charge=-0.8340
       H      0.0570    -2.2440     0.0000      ForceField.Type=H         ForceField.Charge=0.4170
       H      0.9110    -3.4950     0.0000      ForceField.Type=H         ForceField.Charge=0.4170
  End
  BondOrders
        1  2  1.0
        1  3  1.0
        4  5  1.0
        4  6  1.0
  End
End

Engine ForceField
  Type Tripos5.2
EndEngine
eor