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Sonoluminescence

Greenland, PT; (1999) Sonoluminescence. CONTEMP PHYS , 40 (1) 11 - 30.

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Abstract

Small bubbles driven by an acoustic field in water glow. The properties of the light they emit seen? to suggest that it has a black body spectrum, with no features specific to the atomic properties of the gas within? the bubble, and that it is emitted in short pulses. In this review: I describe experiments which have been none to measure properties of the light emission and the dynamics of the bubble wall. I concentrate on bubbles which contain noble gases, and fit the experiments specific to a black body spectrum . Tests are shown to be generally good, and correspond to temperatures similar to 25 000 K. I describe how a small bubble of noble gas can be expected to radiate at this temperature, and shell that collisional excitation and pressure broadening can account for the observed spectrum, but that simple adiabatic compression of the gas tends to overestimate the source temperature, particularlly for Ar and Xe. The significance of new experimental results on the pulse duration is stressed. I discuss theories of the collapse of the bubble, and describe calculations which? show that non-uniform gas behaviour can be important. The sensitivity of the gas motion to the bubble collapse, and the ambiguities of the equations which describe the wall motion are discussed. I also give some details of an alternative theory based oil quantum electrodynamics. Experiments on trapped helium ale identified as the most sample, and a calculation based on the ideas described in this article is presented.

Type: Article
Title: Sonoluminescence
Keywords: SINGLE-BUBBLE SONOLUMINESCENCE, PICOSECOND SONOLUMINESCENCE, COMPRESSIBLE LIQUID, CASIMIR LIGHT, RADIATION, DYNAMICS, SPECTRA
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1307156
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