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III.F.4. (XVIII.D.1.)

Negative orbital occupation numbers

A negative orbital occupation number indicates that the electronic ground state may not be well represented by a single electronic configuration.

Results for BF- (Boron monofluoride anion)

The following table lists the minimum orbital occupation numbers


Methods with standard basis sets
aug-cc-pVTZ
Moller Plesset perturbation MP2FC -0.01697

The following table lists the T1 diagnostic


Methods with standard basis sets
6-31G*
Coupled Cluster CCSD 0.01836