Multiconfiguration molecular mechanics algorithm for potential energy surfaces of chemical reactions

Yongho Kim, José C. Corchado, Jordi Villà, Jianhua Xing, Donald G. Truhlar

Research output: Contribution to journalArticlepeer-review

151 Scopus citations


We present an efficient algorithm for generating semiglobal potential energy surfaces of reactive systems. The method takes as input molecular mechanics force fields for reactants and products and a quadratic expansion of the potential energy surface around a small number of geometries whose locations are determined by an iterative process. These Hessian expansions might come, for example, from ah initio electronic structure calculations, density functional theory, or semiempirical molecular orbital theory. A 2 × 2 electronic diabatic Hamiltonian matrix is constructed from these data such that, by construction, the lowest eigenvalue of this matrix provides a semiglobal approximation to the lowest electronically adiabatic potential energy surface. The theory is illustrated and tested by applications to rate constant calculations for three gas-phase test reactions, namely, the isomerization of 1,3-cis-pentadiene, OH+CH4→H2O+CH3, and CH2Cl+CH3F →CH3CH2F.

Original languageEnglish (US)
Pages (from-to)2718-2735
Number of pages18
JournalJournal of Chemical Physics
Issue number6
StatePublished - Feb 8 2000


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