Infrared Spectrum of the Pyrene Anion in the CH Stretching Region

In
this work, we report the infrared spectrum of the pyrene anion,
measured using messenger tagging with up to three Ar atoms. We assign
the spectrum using density functional theory and vibrational perturbation
theory. We discuss our results in the context of computed and experimental
spectra from the literature as well as recent observations from astronomical
sources, addressing the question of whether polycyclic aromatic hydrocarbon
anions could contribute to the strong infrared emission bands at 3.29
μm from carbon-rich regions of space.