Cross sections and rate coefficients for vibrational excitation of h2o by electron impact

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Abstract

Cross-sections and thermally averaged rate coefficients for vibration (de-)excitation of a water molecule by electron impact are computed; one and two quanta excitations are considered for all three normal modes. The calculations use a theoretical approach that combines the normal mode approximation for vibrational states of water, a vibrational frame transformation employed to evaluate the scattering matrix for vibrational transitions and the UK molecular R-matrix code. The interval of applicability of the rate coefficients is from 10 to 10,000 K. A comprehensive set of calculations is performed to assess uncertainty of the obtained data. The results should help in modelling non-LTE spectra of water in various astrophysical environments.

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Ayouz, M., Faure, A., Tennyson, J., Tudorovskaya, M., & Kokoouline, V. (2021). Cross sections and rate coefficients for vibrational excitation of h2o by electron impact. Atoms, 9(3). https://doi.org/10.3390/atoms9030062

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