Nonlinear Phenomena in Complex Systems, 2018, Vol.21, No.1, pp.56

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2018, Vol.21, No.1, pp.56 - 61

Chemical Shifts of K_α1 and K_α2 Lines in X-ray Emission Spectra of Yb(II)/Yb(III) Fluorides: a Quantum Chemical Study
V. M. Shakhova, S. G. Semenov, Yu. V. Lomachuk, Yu. A. Demidov, L. V. Skripnikov, N. S. Mosyagin, A. V. Zaitsevskii, A. D. Kudashov, and A. V. Titov

Chemical shifts of K_α1 (2p_3/2 − 1s_1/2) and K_α2 (2p_1/2 − 1s_1/2) lines X-ray emission spectra (XES) of Yb in its fluorine compounds were calculated. Valence transition Yb(II) → Yb(III) was considered on examples of YbF₂, Yb₂F₄, and YbF₃ molecules and YbF⁺₂ cation. Relativistic pseudopotential and corresponding basis sets for ytterbium have been generated and used in Hartree–Fock and DFT PBE0 calculations. The results for a threefold coordinated Yb(II) in the FYbF₂YbF dimer indicate a very weak dependence of the chemical shifts on the Yb coordination number as well as on association of ytterbium difluoride molecules. The XES chemical shifts in ytterbium compounds are primarily associated with different population of the 4f-shell.

Key words: chemical shift, K_α1 and K_α2 X-ray emission lines, relativistic pseudopotential, Hartree– Fock method, DFT PBE0

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