Nonequilibrium vibrational excitation of OH radicals generated during multibubble cavitation in water

The Journal of Physical Chemistry. a
Abdoul Aziz NdiayeSergey I Nikitenko

Abstract

The sonoluminescence (SL) spectra of OH(A(2)Σ(+)) excited state produced during the sonolysis of water sparged with argon were measured and analyzed at various ultrasonic frequencies (20, 204, 362, 609, and 1057 kHz) in order to determine the intrabubble conditions created by multibubble cavitation. The relative populations of the OH(A(2)Σ(+)) v' = 1-4 vibrational states as well as the vibronic temperatures (T(v), T(e)) have been calculated after deconvolution of the SL spectra. The results of this study provide evidence for nonequilibrium plasma formation during sonolysis of water in the presence of argon. At low ultrasonic frequency (20 kHz), a weakly excited plasma with Brau vibrational distribution is formed (T(e) ~ 0.7 eV and T(v) ~ 5000 K). By contrast, at high-frequency ultrasound, the plasma inside the collapsing bubbles exhibits Treanor behavior typical for strong vibrational excitation. The T(e) and T(v) values increase with ultrasonic frequency, reaching T(e) ~ 1 eV and T(v) ~ 9800 K at 1057 kHz.

Citations

Mar 12, 2016·Ultrasonics Sonochemistry·B GielenT Van Gerven
Dec 10, 2015·The Journal of Physical Chemistry. B·Temim OuerhaniSergey I Nikitenko
Nov 13, 2015·Ultrasonics Sonochemistry·Vincent MorosiniSergey I Nikitenko
Sep 19, 2015·Ultrasonics Sonochemistry·Ekaterina V Skorb, Helmuth Möhwald
Dec 7, 2013·Ultrasonics Sonochemistry·Nathalie M NavarroSergey I Nikitenko
Aug 22, 2013·Ultrasonics Sonochemistry·Laura Stricker, Detlef Lohse
Oct 25, 2016·Ultrasonics Sonochemistry·Andrea ThiemannRobert Mettin
Mar 4, 2017·Scientific Reports·Elodie DalodièreSergey I Nikitenko
Sep 22, 2017·Physical Chemistry Chemical Physics : PCCP·Rachel PfliegerSergey I Nikitenko
Jul 26, 2012·Chemistry : a European Journal·Adam BrotchieHelmuth Möhwald
Jan 29, 2013·Angewandte Chemie·Abdoul Aziz NdiayeSergey I Nikitenko
Aug 8, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Kyuichi Yasui
Oct 9, 2013·The Journal of Physical Chemistry. B·David J Flannigan, Kenneth S Suslick
Feb 21, 2013·The Journal of Physical Chemistry. B·Rachel PfliegerSergey I Nikitenko

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