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Article Dans Une Revue Journal of Physical Chemistry A Année : 2023

XPS core-level chemical shift by ab initio many-body theory

Résumé

X-ray photoemission spectroscopy (XPS) provides direct information on the atomic composition and stoichiometry by measuring core electron binding energies. Moreover, according to the shift of the binding energy, so-called chemical shift, the precise chemical type of bonds can be inferred, which brings additional information on the local structure. In this work, we present a theoretical study of the chemical shift firstly by comparing different theories, from Hartree-Fock (HF) and density-functional theory (DFT) to many-body perturbation theory (MBPT) approaches like the GW approximation and its static version (COHSEX). The accuracy of each theory is assessed by benchmarking against the experiment on the chemical shift of the carbon 1s electron in a set of molecules. More importantly, by decomposing the chemical shift into different contributions according to terms in the total Hamiltonian, the physical origin of the chemical shift is identified as classical electrostatics.

Dates et versions

hal-04234936 , version 1 (10-10-2023)

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Citer

Iskander Mukatayev, Florient Moevus, Benoît Sklénard, Valerio Olevano, Jing Li. XPS core-level chemical shift by ab initio many-body theory. Journal of Physical Chemistry A, 2023, 127 (7), pp.1642-1648. ⟨10.1021/acs.jpca.3c00173⟩. ⟨hal-04234936⟩
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