Sonoluminescence from non-aqueous liquids |
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Authors: | K S Suslick E B Flint |
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Institution: | School of Chemical Sciences, University of Illinois at Urbana-Champaign 61801. |
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Abstract: | Our understanding of the chemical effects of high-intensity ultrasonic irradiation of liquids is still quite limited. It is generally accepted that sonochemistry results from acoustic cavitation: the creation, growth, and implosive collapse of bubbles in ultrasonically irradiated liquids. The mechanism of sonoluminescence in aqueous systems has been a matter of some dispute; recent discussions have suggested at least three possible origins: black-body emission, chemiluminescence from radical recombination, and electric discharge. Few studies of non-aqueous sonoluminescence, however, have been conducted. We present here the first spectrally resolved sonoluminescence spectra from hydrocarbon and halocarbon liquids. These spectra originate unambiguously from excited-state molecules created during acoustic cavitation. These high-energy species probably result from the recombination of radical and atomic species generated during the high temperatures and pressures of cavitation. |
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