This work presents rovibrational spectra and spectroscopic constants of the hydronium ion, implying insights into molecular states.
This work presents the rovibrational spectra of the two strongest first overtone bands of the asymmetric stretching mode ν3 (2ν32+ and 2ν32-) 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 2ν32-.
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Schleif et al. (2025) studied this question.
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