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A combined molecular dynamics plus quantum mechanics method for investigation of dynamic effects on local surface structures
KTH, Superseded Departments, Biotechnology.
2004 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 120, no 10, 4939-4948 p.Article in journal (Refereed) Published
Abstract [en]

A combined molecular dynamics (MD)+quantum mechanics (QM) method for studying processes on ionic surfaces is presented. Through the combination of classical MD and ab initio embedded-cluster calculations, this method allows the modeling of surface processes involving both the structural and dynamic features of the substrate, even for large-scale systems. The embedding approach used to link the information from the MD simulation to the cluster calculation is presented, and rigorous tests have been carried out to ensure the feasibility of the method. The electrostatic potential and electron density resulting from our embedded-cluster model have been compared with periodic slab results, and confirm the satisfying quality of our embedding scheme as well as the importance of applying embedding in our combined MD+QM approach. We show that a highly accurate representation of the Madelung potential becomes a prerequisite when the embedded-cluster approach is applied to temperature-distorted surface snapshots from the MD simulation.

Place, publisher, year, edition, pages
2004. Vol. 120, no 10, 4939-4948 p.
Keyword [en]
embedded-cluster calculations, alkali-halide crystals, abinitio hartree-fock, ab-initio, ionic-crystal, model-calculations, mgo, simulation, mgo(001), defects
URN: urn:nbn:se:kth:diva-23218DOI: 10.1063/1.1635802ISI: 000189355800044OAI: diva2:341916
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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