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C$_3$P$^-$ is analogous to the known interstellar anion C$_3$N$^-$ withphosphorus replacing the nitrogen in a simple step down the periodic table. Inthis work, it is shown that C$_3$P$^-$ is likely to possess a dipole-boundexcited state. It has been hypothesized and observationally supported thatdipole-bound excited states are an avenue through which anions could be formedin the interstellar medium. Additionally, C$_3$P$^-$ has a valence excitedstate that may lead to further stabilization of this molecule, and C$_3$P$^-$has a larger dipole moment than neutral C$_3$P ($\sim 6$ D vs. $\sim 4$ D). Assuch, C$_3$P$^-$ is probably a more detectable astromolecule than even itscorresponding neutral radical. Highly-accurate quantum chemical quartic forcefields are also applied to C$_3$P$^-$ and its singly $^{13}$C substitutedisotopologues in order to provide structures, vibrational frequencies, andspectroscopic constants that may aid in its detection.

Electronic and Rovibrational Quantum Chemical Analysis of C$_3$P$^-$: The Next Interstellar Anion?