Bubbles deformation and interface disruption as a source of sonochemical and sonoluminescent activity

Nature of the “Extreme Conditions” in Single Sonoluminescing Bubbles

“…This plasma exhibits the properties of a sparklike process. These results explain the analogies reported previously between sonochemistry/sonoluminescence and plasma chemistry. 5d, Plasma diagnostics does not, of course, explain the process causing a bubble to produce a sparklike plasma. It indicates “only” the nature of the “extreme conditions” that a bubble is able to generate.…”

“…The particular properties of SBSL have led to intense thinking on the nature of the conditions developed during bubble collapse . This situation is caused by the fact that the hot-spot theory, generally accepted to explain sonoluminescent activity associated with acoustic cavitation, fails to explain SBSL 5b…”

“…The particular properties of SBSL have led to intense thinking on the nature of the conditions developed during bubble collapse . This situation is caused by the fact that the hot-spot theory, generally accepted to explain sonoluminescent activity associated with acoustic cavitation, fails to explain SBSL 5b for example, show that the ultrashort duration of SBSL flashes is not explainable by the (almost) adiabatic compression described in the hot-spot theory.…”

“…Kamath et al, for example, show that the ultrashort duration of SBSL flashes is not explainable by the (almost) adiabatic compression described in the hot-spot theory. This stimulated the developments of new theoretical models, among which the converging shock-wave model which describes that, a few tens of picosecond before the bubble reaches its minimum radius (18 or 100 ps according to Wu and Roberts 5c or Moss et al.,5f respectively), a converging shock wave could energize a small gaseous core at the very center of the bubble during picosecond period.…”