bond C O        0.12  300000 # Atom 1 Atom 2 Bond-length (nm) Force-Constant (kJ/mol/nm^2)
bond O O      0.24  100000
sigma O          0.315  # nm
sigma C          0.32
epsilon O        0.64  # kJ/mol
epsilon C        0.5
mass C          12 
mass O          16       
charge C          0.4
charge O          -0.2     
