Electronic structure and chemical bonding in the ground states of Tc-2 and Re-2

Antonio Carlos Borin, Joao Paulo Gobbo, Björn Roos

Research output: Contribution to journalArticlepeer-review


Multiconfiguration second-order perturbation theory, including relativistic effects and spin-orbit coupling, has been employed to investigate the nature of the chemical bonding in the ground state of Tc-2 and Re-2. The Tc-2 ground state is found to be a 0(g)(+) state, with an effective bond order (EBO) of 4.4, and a dissociation energy of 3.25 eV. The Re-2 ground state is a 1(g) state, with EBO = 4.3. Almost degenerate to it, is a 0(g)(+) state (T-e = 77 cm(-1)), with EBO = 4.1. Experimental evidence also indicates that the ground state is of 1(g) nature. The dissociation energy is computed to be 5.0 eV in agreement with an experimental estimate of 4 +/- 1 eV.
Original languageEnglish
Pages (from-to)1035-1040
JournalMolecular Physics
Issue number8-12
Publication statusPublished - 2009

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)

Subject classification (UKÄ)

  • Theoretical Chemistry

Free keywords

  • transition metal bonding
  • transition metal diatoms
  • ground state
  • CASPT2


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