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parameters and theory unchanged for the elements H, C, N, O and F. But, other elements have been parameterized using an additional set of d-orbitals in the basis set and with two-center core–core parameters, rather than the
Gaussian functions used to modify the core–core potential in
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Dewar, Michael J. S.; Zoebisch, Eve G.; Healy, Eamonn F.; Stewart, James J. P. (1985). "Development and use of quantum mechanical molecular models. 76. AM1: A new general purpose quantum mechanical molecular model".
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Clark T, Alex A, Beck B, Chandrasekhar J, Gedeck P, Horn AHC, Hutter M, Martin B, Rauhut G, Sauer W, Schindler T, Steinke T (2005) Computer-Chemie-Centrum. Universität
Erlangen-NĂĽrnberg, Erlangen
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47:. Additionally, for transition metal-hydrogen interactions, a distance dependent term is used to calculate core-core potentials rather than the constant term.
27:. The method was developed by Timothy Clark and co-workers (in Computer-Chemie-Centrum, Universität Erlangen-Nürnberg) and published first in 2003.
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Winget, P; Horn, AH; Selçuki, C; Martin, B; Clark, T (2003). "AM1* parameters for phosphorus, sulfur and chlorine".
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Winget, Paul; Clark, Timothy (2005). "AM1* parameters for aluminum, silicon, titanium and zirconium".
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Kayi, H; Clark, T (2007). "AM1* parameters for copper and zinc".
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