Abstract
This study demonstrates the susceptibility of the Escherichia coli and Bacillus subtilis planktonic bacteria to inactivation by shock acoustic waves that arise from the rapid formation and collapse of vapor bubbles in a medium locally heated to its boiling point. Local heating of the medium occurred due to heat release through the relaxation of highly excited electronic states of exogenous molecules of organic dyes. Dye molecules were excited by nanosecond laser pulses. Highly excited electronic states were formed as a result of stepwise absorption of two quanta of laser radiation. The dependence of the efficiency of microorganism inactivation on the dye concentration, excitation power density, and the distance from the shock wave source was studied.
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