Electronic structure of LaF+ and LaF from frozen-core four-component Relativistic multiconfigurational quasidegenerate perturbation theory

Hiroko Moriyama, Yoshihiro Watanabe, Haruyuki Nakano, Hiroshi Tatewaki

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9 Citations (Scopus)

Abstract

The electronic structure of the molecules LaF+ and LaF was studied using frozen-core four-component multiconfigurational quasidegenerate perturbation theory. To obtain proper excitation energies for LaF+, it was essential to include electronic correlations between the outermost valence electrons (4f, 5d, and 6s) and ionic core electrons composed of (4s, 4p, 4d, 5s, and 5p). The lowest-lying 16 excited states were examined for LaF +, and the lowest 30 states were examined for LaF. The excitation energies calculated for LaF+ agree with the available experimental values, as well as with values from ligand field theory. Errors are within 0.4 eV; for example, the highest observed state 2Π is 3.77 eV above the ground state, and the present value is 4.09 eV. For LaF, agreement between the experimental and theoretical state assignments and between the experimental and calculated excitation energies was generally good, except for the electron configurations of certain states. Errors are within 0.4 eV except for a single anomaly; for example, the highest observed excited-state discussed in this work is 2.80 eV above the ground state, and the present value is 2.42 eV. We discuss the characteristics of the bonding in LaF+ and LaF.

Original languageEnglish
Pages (from-to)2683-2692
Number of pages10
JournalJournal of Physical Chemistry A
Volume112
Issue number12
DOIs
Publication statusPublished - Mar 27 2008

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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