Near-infrared high resolution overtone spectroscopy of the hydronium ion H₃O⁺: the 2ν₃²⁺ and 2ν₃^2- bands

2025/09/19 by Schleif, Chiara, Bunn, Hayley A., Jiménez-Redondo, Miguel +2
#Atomic Physics (physics.atom-ph) #Chemical Physics (physics.chem-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2509.16009

Abstract

This work presents the rovibrational spectra of the two strongest first overtone bands of the asymmetric stretching mode ν₃ (2ν₃²⁺ and 2ν₃^2-) of the hydronium ion, H₃O⁺. The measurements were performed in a temperature-variable cryogenic 22 pole ion trap using leak-out spectroscopy (LOS), covering an energy range of 6750-6950 cm^-1. The spectra were fit with a standard oblate symmetric top Hamiltonian and additional off-diagonal matrix elements accounting for l-doubling to obtain the spectroscopic constants and the band origins, which were determined to be 6845.610(14) cm^-1 for 2ν₃²⁺ and 6878.393(13) cm^-1 for 2ν₃^2-.

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