Spectroscopic study of the tunneling dynamics in N2-water observed in the O–D stretch region
(2021) Journal of Chemical Physics — Vol. 155, n° 17, p. 174309 (2021)
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- Authors
Moazzen-Ahmadi, N. 
- Abstract
- The O–D stretch rovibrational spectra of N2–D2O and N2–DOH were measured and analyzed. A combination band involving the in-plane N2 bending vibration was also observed. These bands were recorded using a pulsed-slit supersonic jet expansion and a mid-infrared tunable optical parametric oscillator. The spectra were analyzed by considering the feasible tunneling motions, and transitions were fitted to independent asymmetric rotors for each tunneling state. The rotational constants of the four tunneling components of N2–D2O were retrieved for the excited vibrational states. A two order of magnitude increase in the tunneling splittings is observed for the asymmetric O–D stretch (ν3 in D2O) excitation compared to the symmetric stretch (ν1 in D2O) and to the ground vibrational state. This last finding indicates that the ν3 vibrational state is likely perturbed by a combination state that includes ν1. Finally, the observation of a local perturbation in the ν3 vibrational band, affecting the positions of few rovibrational levels, provides an experimental lower limit of the dissociation energy of the complex, D0 > 120 cm−1.
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Citations
Glorieux, R., Lauzin, C., Barclay, A. J., Herman, M., & Moazzen-Ahmadi, N. (2021). Spectroscopic study of the tunneling dynamics in N2-water observed in the O–D stretch region. Journal of Chemical Physics, 155(17), 174309. https://doi.org/10.1063/5.0071732 (Original work published 2021)