"A new way to examine the composition of luminous jets of ionised gas known as "plasma needles" could speed their progress towards their use for dental treatment and other medical uses.
A plasma is a cloud of gas broken down into a mélange of free electrons and ions.
At atmospheric pressure and temperature most plasmas reach thousands of degrees Celsius. But in recent years physicists have created "plasma needles" that are cold enough to touch but deadly to bacteria.
Chinese researchers have now built a device that generates a cold plasma and can also measure the flow of electrons inside it. That could help reveal new insights into the nature of such plasmas so they can be fine-tuned for biomedical use."
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