Rovibrational Overtone and Combination Bands of the HCNH+ Ion

Abstract

Spectra of vibrational overtone and combination bands from vibrational ground state of HCNH+ were measured using an action spectroscopy technique with active background suppression in a cryogenic 22 pole radio frequency ion trap apparatus. Spectroscopic constants for the upper vibrational levels of the transitions were determined with vibrational band origins being 6846.77981(90) ${\text{cm}}^{-1}$ ($2{\nu }_1$ , NH stretch), 6640.47624(43) ${\text{cm}}^{-1}$ (${\nu }_1+{\nu }_2$), 6282.03578(63) ${\text{cm}}^{-1}$ ($2{\nu }_2$, CH stretch), and 6588.4894(20) ${\text{cm}}^{-1}$ (${\nu }_2+{\nu }_3+2{\nu }_5^0$). State of the art ab initio VCI calculations up to 10000 ${\text{cm}}^{-1}$ complement the experimental data.

Accepted in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

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