Diagonal and off-diagonal hyperfine structure matrix elements in KCs within the relativistic Fock space coupled cluster theory

Alexander V. Oleynichenko, Leonid V. Skripnikov, Andréi Zaitsevskii, Ephraim Eliav, Vladimir M. Shabaev

Research output

2 Citations (Scopus)

Abstract

The four-component relativistic Fock space coupled cluster method is used to describe the magnetic hyperfine interaction in low-lying electronic states of the KCs molecule. Both diagonal and off-diagonal matrix elements as functions of the internuclear separation R are calculated within the finite-field scheme. The resulting matrix elements exhibit very weak dependence on R for the separations exceeding 8 Å, whereas in the vicinity of the ground-state equilibrium the deviation of molecular HFS matrix elements from the atomic values reaches 15%. The dependence of the computed HFS couplings on the level of core correlation treatment is discussed.

Original languageEnglish
Article number137825
JournalChemical Physics Letters
Volume756
DOIs
Publication statusPublished - Oct 2020

Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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