Interaction of the Fe+ cation with heavy noble gas atoms

Heinemann, Christoph; Schwarz, Joseph; Koch, Wolfram; Schwarz, Helmut
September 1995
Journal of Chemical Physics;9/15/1995, Vol. 103 Issue 11, p4551
Academic Journal
The diatomic iron–noble gas complexes FeAr+, FeKr+, FeXe+, and FeRn+ have been theoretically investigated by means of quantum-chemical calculations including an extensive treatment of electron correlation. Potential energy curves and spectroscopic constants for the lowest 4Δ and 6Δ states are derived from an open-shell coupled-cluster approach and the relative energies of all seven low-lying electronic states are evaluated by the multireference configuration interaction method. While in FeAr+ the lowest quartet and sextet states are found to be energetically almost degenerate, the heavier Fe+–noble gas molecules are predicted to exhibit 4[uppercase_phi_synonym] ground states. From a qualitative point of view bonding in these species is shown to be electrostatic in origin with intrinsically higher interaction energies for the quartet as compared to the sextet states. For calibration purposes, also an accurate calculation of the 4F(4s03d7)–6D(4s13d6) energy difference in the atomic Fe+ cation is provided. © 1995 American Institute of Physics.


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