Sonoluminescence temperatures during multi-bubble cavitation

摘要: Acoustic cavitation—the formation and implosive collapse of bubbles—occurs when a liquid is exposed to intense sound. Cavitation can produce white noise, sonochemical reactions, erosion hard materials, rupture living cells the emission light, or sonoluminescence1,2. The concentration energy during enormous: an emitted photon exceed density sound field by about twelve orders magnitude3, it has long been predicted that interior bubble temperature reaches thousands degrees Kelvin collapse. But experimental measurements4,5 conditions inside cavitating bubbles are scarce, there have no studies as function parameters. Here we use multi-bubble sonoluminescence from excited states metal atoms spectroscopic probe temperatures bubbles. atomic allows us change properties gas–vapour mixture within bubble, thus vary effective for 5,100 2,300 K. We observe in accord with those expected compressional heating cavitation.