Sixty-six lines in the v4 band of H3O+ have been measured using diode laser velocity modulation spectroscopy. 36 have been assigned to the a-a component of the spectrum and 30 to the s-s component. The observed spectra were fit to a standard symmetric top Hamiltonian including the effects of l-type doubling. The band origin of the s-s transitions is at 1625.947(5) cm-1, whereas that of the a-a component lies at 1638.533(3) cm-1. The effect of the asymmetric bending vibration on the inversion splitting is in qualitative agreement with previous theoretical results, but the experimental band origins deviate by about 60 cm-1 from calculated values. Coriolis perturbations are found to have an important effect on the rotational constants of the v4 and v2 levels.
|Original language||English (US)|
|Number of pages||5|
|Journal||The Journal of Chemical Physics|
|State||Published - 1987|
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry