Binding energies of molecular solids from fragment and periodic approaches

نویسندگان

چکیده

We calculate binding energies of four molecular solids using the Hartree-Fock (HF) and second-order M{\o}ller-Plesset perturbation theory (MP2). obtain within many-body expansion (MBE) as well periodic boundary conditions (PBC) to compare both approaches. The systems we study are methane, carbon dioxide, ammonia, methanol. use tight convergence settings with a high precision, estimate uncertainties be only few tenths percent. discuss several issues that affect quality results which need considered reach precision for MBE PBC. For example, HF MP2 PBC benefited from real-space Coulomb cut-off technique, was improved by modifying order summation. Finally, numerical noise made evaluation some contributions difficult effect reduced smaller basis sets less critical terms.

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ژورنال

عنوان ژورنال: Electronic structure

سال: 2021

ISSN: ['2516-1075']

DOI: https://doi.org/10.1088/2516-1075/ac25d6