Ro-vibrational spectra of CC stretching modes of C3H＋ and HC3O＋

The carbon-rich molecular ions C₃H^＋ and HC₃O^＋ have been studied for the first time at high spectral resolution in the $5\mu m$ wavelength regime employing leak-out spectroscopy of their ${\nu }_2$ (C₃H^＋) and ${\nu }_3$ (HC₃O^＋) vibrational fundamentals. All measurements were performed in a newly built cryogenic 22-pole ion trap apparatus, the COLtrap II instrument. Besides the action spectroscopic characterization the new measurements have also been used towards optimization and an improved understanding of the leak-out process via a semi-quantitative kinetics model for which some rates are determined or estimated and rationalized.