Abstract
C3P− is analogous to the known interstellar anion C3N− with phosphorus replacing nitrogen in a simple step down the periodic table. In this work, it is shown that C3P− is likely to possess a dipole-bound excited state. It has been hypothesized and observationally supported that dipole-bound excited states are an avenue through which anions could be formed in the interstellar medium. Additionally, C3P− has a valence excited state that may lead to further stabilization of this molecule, and C3P− has a larger dipole moment than neutral C3P (∼6 D versus ∼4 D). As such, C3P− is probably a more detectable astromolecule than even its corresponding neutral radical. Highly accurate quantum chemical quartic force fields are also applied to C3P− and its singly 13C substituted isotopologues in order to provide structures, vibrational frequencies, and spectroscopic constants that may aid in its detection.
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