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Electronic absorptions of C5+ detected in the visible through action spectroscopy in a cryogenic trap

E. S. Reedy, J. Rademacher, R. Szabla,
Published: 13 October 2021

Abstract: The 2Πg←X2Σu+ electronic spectrum of C5+ in the gas-phase with origin band at 513nm is reported following experiments in a cryogenic ion trapping instrument. Buffer gas-cooled C5+ ions, generated by laser vaporisation of graphite, were investigated using two action spectroscopy approaches. Laser-induced dissociation of weakly bound C5+−Hen complexes synthesised in the trap reveal a linear dependence of the absorption energies on n allowing prediction of those of the bare ion C5+. These results are confirmed in two colour experiments on C5+, by monitoring fragmentation into the C3++C2 product channel. The data are supplemented with high-level electronic structure calculations which support the assignment of D∞h symmetry to the ground electronic state. These laboratory results provide the requisite data needed for spectroscopic detection of this structure in terrestrial and extraterrestrial environments. GRAPHICAL ABSTRACT
Keywords: Cryogenic ion traps / action spectroscopy / carbon chains / interstellar molecules / helium tagging

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