Resonance states of are studied with high-level ab initio methods. In analogy to the fundamental anions and the ground state of 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 of 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 is also investigated. Connection to recently identified long-lived high-spin states of and is made and their relations are discussed.
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