Theoretical Chemistry Accounts

, 133:1436 | Cite as

Accurate first principles calculations on chlorine fluoride ClF and its ions ClF±

  • Athanassios A. Vassilakis
  • Apostolos Kalemos
  • Aristides Mavridis
Regular Article
Part of the following topical collections:
  1. Dunning Festschrift Collection


The present work focuses on the first (lightest) of the six diatomic interhalogens, namely ClF and its ions ClF+ and ClF, in an effort to better understand these interesting species. Toward this end, we have performed highly correlated all electron ab initio calculations of multireference (MRCI) and single-reference coupled-cluster calculations, employing quintuple and sextuple correlation consistent basis sets. Within the Λ − S ansatz, we have examined all 12 states of ClF correlating adiabatically with the first energy channel, all 23 states of ClF+ correlating with the first three channels, and three states out of four of ClF correlating with the first two channels Cl + F and Cl + F. Full potential energy curves at the MRCI/quintuple zeta level have been constructed for 12, 21, and 3 states of ClF, ClF+, and ClF, respectively. After correcting for core–subvalence and scalar relativistic effects, albeit small as expected, and spin–orbit interactions, most of our results are in excellent agreement with available experimental data. Some lingering questions have been definitely settled. Our final recommended binding energies (D 0 in kcal/mol) and equilibrium bond distances (r e in Å) for ClF (X 1Σ+), ClF+ (X 2Π), and ClF (X 2Σ+) are [60.35, 1.6284], [67.40, 1.5357], and [29.80, 2.151], respectively. The adiabatic electron affinity of ClF, ClF (X 1Σ+) + e → ClF (X 2Σ+), is EAad = 2.25 ± 0.01 eV about 0.6 eV smaller than the suggested experimental value which is certainly wrong.


Interhalogen ClF Ab initio 



One of us (A.V.) expresses his gratitude to Dr. C. N. Sakellaris for helpful discussions.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Athanassios A. Vassilakis
    • 1
  • Apostolos Kalemos
    • 1
  • Aristides Mavridis
    • 1
  1. 1.Laboratory of Physical Chemistry, Department of ChemistryNational and Kapodistrian University of AthensAthensGreece

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