RM1

  |   Source

RM1 (Recife Model 1) is a reparameterisation of AM1 for H, C, N, O, P, S, F, Cl, Br, and I. It is distributed as an external file for recent versions of MOPAC, as the default model for a modified version of the public domain MOPAC, and also can be implemented in HyperChem.