Martinez-Casado, Ruth and Usvyat, Denis and Mallia, Giuseppe and Maschio, Lorenzo and Casassa, Silvia and Ellis, John and Schuetz, Martin and Harrison, Nicholas M. (2014) Diffraction of helium on MgO(100) surface calculated from first-principles. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16 (39). pp. 21106-21113. ISSN 1463-9076, 1463-9084
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In this work we simulate the diffraction peak intensities of He beams scattered on the MgO(100) surface from first principles. It turns out that diffraction peak intensities are extremely sensitive to the quality of the potential describing the He-MgO surface interaction. Achieving the required accuracy in first principles calculations is very challenging indeed. The present work describes a first principles protocol able to achieve very high accuracy for reasonable computational cost. This method is based on periodic local second-order Moller-Plesset perturbation theory where systematic corrections for basis set truncation and for high-order electronic correlation are introduced using coupled cluster calculations on finite model systems mimicking the target system. For the He-MgO system the requirements with respect to the level of theory are very high; it turns out that contributions from connected quadruple excitations are non-negligible. Here we demonstrate that using this protocol, it is possible to reach the accuracy in the He-MgO potential that is required to predict the observed He diffraction peak intensities.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PLESSET PERTURBATION-THEORY; LOCAL MP2; SELECTIVE ADSORPTION; ELECTRON CORRELATION; PERIODIC-SYSTEMS; SCATTERING; ATOMS; CRYSTALS; CRYSCOR; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Research Group Theoretical Chemistry > PD Dr. Denis Usvyat |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Aug 2019 07:35 |
| Last Modified: | 12 Aug 2019 07:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9338 |
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