Publication details

Unexpected rotational distribution of the ground electronic state OH(X-2 pi) generated by plasma at the interface with liquid water

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Authors

VORÁČ Jan SYNEK Petr HODER Tomáš

Year of publication 2018
Type Article in Periodical
Magazine / Source PLASMA SOURCES SCIENCE & TECHNOLOGY
MU Faculty or unit

Faculty of Science

Citation
web http://dx.doi.org/10.1088/1361-6595/aad0e3
Doi http://dx.doi.org/10.1088/1361-6595/aad0e3
Keywords hydroxyl radical; laser-induced fluorescence; rotational distribution; temperature quasi-Boltzmann; streamer; liquid water interface
Description An unexpected rotational distribution of the ground electronic state OH(X-2 pi) was observed by laser-induced fluorescence in a surface barrier discharge in contact with a liquid water interface. Analysis assuming a Boltzmann distribution yielded an unrealistically high rotational temperature above 600 K in the post-discharge phase. This is interpreted as a quasi-Boltzmann rotational distribution that is not in equilibrium with the translational temperature of the background gas. While the peculiarities of rotational distribution of excited OH(A(2) Sigma(+)) are known, the presented results show that even the ground electronic state OH(X-2 pi) does not always have to be a reliable indicator for spectroscopic thermometry in plasmas containing water. A series of similar observations challenges the usual approach in kinetic models, when the rotational distribution is assumed to follow the Boltzmann function with the temperature of surrounding gas.
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