Atoms in Molecules from Alchemical Perturbation Density Functional Theory

von Rudorff, Guido Falk and von Lilienfeld, Anatole. (2019) Atoms in Molecules from Alchemical Perturbation Density Functional Theory. Journal of Physical Chemistry B, 123 (47). pp. 10073-10082.

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Official URL: https://edoc.unibas.ch/94206/

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Based on thermodynamic integration, we introduce atoms in molecules (AIM) using the orbital-free framework of alchemical perturbation density functional theory (APDFT). Within APDFT, atomic energies and electron densities in molecules are arbitrary because any reference system and integration path can be selected as long as it meets the boundary conditions. We choose the uniform electron gas (jellium) as a reference and linearly scale up all nuclear charges, situated at any query molecule's atomic coordinates. Within the approximations made when calculating one-particle electron densities, this universal choice affords unambiguous and exact definitions of energies and electron densities of AIMs. Numerical results are presented for neutral small molecules (CO, N-2, BF, CO2), various small molecules with different electronic hybridization states of carbon (CH4, C2H6, C2H4, C2H2, HCN), and all of the possible BN-doped mutants connecting benzene to borazine (C2nB3-nN3-nH6, 0 <= n <= 3). Our results, as well as comparison to atomic energy estimates resulting from either DFT trained neural network models or atomic basis set overlap within CCSD, suggest that APDFT based AIMs enable meaningful, interesting, and counterintuitive interpretations of chemical bonding and molecular electron densities.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Former Organization Units Chemistry > Physikalische Chemie (Lilienfeld)
UniBasel Contributors:von Lilienfeld, Anatole
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 Apr 2023 09:09
Deposited On:03 Apr 2023 09:09

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