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Ultrasonic frequency is a key parameter determining multibubble sonoluminescence (MBSL) spectra of water saturated with Ar/O 2 gas mixtures. At 20kHz, the MBSL is quenched by oxygen. By contrast, at high-frequency ultrasound the maximal MBSL intensity is observed in the presence of Ar/20%O 2 gas mixture. Nevertheless, oxygen has no influence on the shape of MBSL spectra. The effect...
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