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Schematic showing the experimental setup using A) a fabricated flask with stopper; B) degassing setup providing different overhead gas pressures; C) measurement of sonochemical activity by 2 methods. The arrows indicate where the 4 types of solution with different gas concentrations (a1: 101325 Pa, a2: 2000 Pa, a3: 33 Pa, a4: 3 Pa) were acquired.
