Resonance states of BF are studied with high-level ab initio methods. In analogy to the fundamental anions N2 and CO, the Π2 ground state of BF has been found to be a short-lived shape-type resonance state exhibiting a lifetime of less than a femtosecond. In contrast, the lowest quartet state Σ4 of BF is clearly long-lived, since the decay channels via direct electron emission and dissociation are closed and all other possible decay channels are spin-forbidden. The lowest sextet state of BF is also investigated. Connection to recently identified long-lived high-spin states of N2 and CO is made and their relations are discussed.

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