Preface to AMPAC™
5.0 Manual

Dear Colleagues,

With this version of AMPAC™, we introduce a truly significant scientific advance: SAM1 parameters for iron. This represents the first time that any of the Dewar-style semiempirical methods have been extended to treat transition metals with incomplete sets of d-electrons.

All of Semichem’s staff is now situated in Kansas City and we are working very hard to develop SAM1 parameters for transition metals and the heavy main group elements. We are also constantly upgrading and expanding the program both as we see areas for improvement and in response to your requests. Thank you for your support, and we look forward to more releases with yet more capabilities in the future.

Many thanks,

Andrew J. Holder

President

May 25, 1994