The effects of experimentally obtained electron correlation and polarization on electron densities and exchange-correlation potentials - Université de Lorraine Access content directly
Journal Articles Journal of Chemical Physics Year : 2023

The effects of experimentally obtained electron correlation and polarization on electron densities and exchange-correlation potentials

Emanuel Hupf
Rumpa Pal
Magdalena Woińska
Dylan Jayatilaka
Simon Grabowsky

Abstract

In X-ray constrained wavefunction (XCW) fitting, external information, such as electron correlation and polarization, is included into a single-determinantal isolated-molecule wavefunction. In a first step, we show that the extraction of these two physical effects by XCW fitting is complete and accurate by comparing to theoretical reference calculations. In a second step, we show that fitting to data from single-crystal x-ray diffraction measurements provides the same results qualitatively and how the physical effects can be separated, although always inherently convolved in the experiment. We further demonstrate that exchange–correlation potentials are systematically affected by XCW fitting in a physically meaningful way, which could be exploited for method development in quantum chemistry, subject to some remaining challenges that we also outline.
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Dates and versions

hal-04046695 , version 1 (26-03-2023)

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Emanuel Hupf, Florian Kleemiss, Tobias Borrmann, Rumpa Pal, Joanna M Krzeszczakowska, et al.. The effects of experimentally obtained electron correlation and polarization on electron densities and exchange-correlation potentials. Journal of Chemical Physics, 2023, 158 (12), pp.124103. ⟨10.1063/5.0138312⟩. ⟨hal-04046695⟩
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