Direct molecular dynamics using quantum chemical hamiltonians: C60 impact on a passive surface

Ya Wen Hsiao, Keith Runge, Marshall G. Cory, Rodney J. Bartlett

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Quantum chemical Hamiltonians of the semiempirical type potentially provide a more reliable description of a potential energy surface for large scale molecular dynamics than does the tight-binding (TB) Hamiltonian, a reparametrized extended Hückel Hamiltonian including a short range repulsion. Their performance is tested here and compared with results from TB simulations. The methods considered are from the zero differential overlap family of semiempirical Hamiltonians, these are the intermediate neglect of differential overlap (INDO) method and three parametrizations of the neglect of differential diatomic overlap (NDDO) method, AM1, PM3, and MNDO. The collision of the C60 molecule with a passive surface at two collision energies is the test problem, where the higher energy leads to shattering of the molecule. The NDDO Hamiltonians are found to give a better qualitative description than the INDO Hamiltonian at both energies and further studies to reparametrize the NDDO form for direct MD are indicated.

Original languageEnglish (US)
Pages (from-to)7004-7010
Number of pages7
JournalJournal of Physical Chemistry A
Volume105
Issue number29
DOIs
StatePublished - Jul 26 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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