Distilled water with argon or air doping
This protocol is extracted from research article:
Bioinspired mechanical device generates plasma in water via cavitation
Sci Adv, Mar 15, 2019; DOI: 10.1126/sciadv.aau7765

Because no light emission was observed in distilled water tank without gas doping, argon or air was doped into the freshly opened distilled water via a bubbling disc for 30 min to ensure that the solubility of argon in the water tank was saturated. Argon was chosen initially because of its accessibility, known excitation emission spectra in the visible light range, a larger polytropic exponent at bubble collapse, and effective use in single-bubble sonoluminescence experiments.

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