Sonoluminescence from a Single Bubble Driven at 1 Megahertz

Abstract

Measurements of the spectrum of sonoluminescence from an isolated bubble driven at 1 MHz are well fit by assuming thermal bremsstrahlung from a transparent 10(6) degree plasma. According to this interpretation, the photon-matter mean free path is larger than the light-emitting radius of a 1 MHz bubble, but smaller than the light-emitting radius for bubbles driven at approximately 40 kHz, thus accounting for the observed blackbody spectrum at 40 kHz.

Confirmatory experiments for nuclear emissions during acoustic cavitation

“…E-mail addresses: yiban@purdue.edu (Y. Xu), butt@purdue.edu (A. Butt). to the generation of light flashes attributed to sonoluminescence and involves energy focusing of ∼10 11 (Crum and Matula, 1997;Camara et al, 2004). The possibility of using the phenomenon of sonoluminescence for attaining thermonuclear fusion in collapsing gas-vapor cavities has been predicted theoretically as a possibility if appropriate techniques and methodologies were discovered and developed to lead to intenseenough compressions and heating (Moss et al, 1996;Nigmatulin et al, 2004;Taleyarkhan et al, 2004b).…”

Molecular and atomic emission during single- bubble cavitation in concentrated sulfuric acid

“…Fitting of the featureless spectra to theoretical continuous emission mechanisms such as blackbody and bremsstrahlung emission have led to predictions of visible temperatures being upwards of 10 4 K with core temperatures being much higher. [4][5][6] It is difficult, however, to determine the exact nature of the continuum in SBSL from pure water since no observable emitters are typically present. The continuum could be due to a combination of continuous emission mechanisms including blackbody, bremsstrahlung, and overlapping contributions from multiple atomic and small molecule emitters arising from sonolysis of water.…”

Symmetry reduction for molecular dynamics simulation of an imploding gas bubble

“…[11] and real physical sonoluminescing systems the brute force approach would take about a year to simulate even the smallest such system known [17], containing 50 · 10 6 atoms.…”