title: Bubble dynamics near the onset of single-bubble sonoluminescence.
abstract: A number of groups have reported measurements of the location in the parameter space of bubble size versus acoustic pressure amplitude of shape- and size-stable bubbles. For air/water systems, a general trend emerges: stable bubbles are found on one of two line paths in this space defined by their range of acoustic pressure. Bubbles on the higher-pressure path emit light. There have been few studies of the transition between these two paths. In this work we describe our observations of this transition regime. In this regime, a slow time scale oscillation (period 2-7 s) in the bubble size, position, and phase of flash timing can be observed. At lower dissolved gas concentrations, a hysteresis in the bubble size as a function of acoustic pressure is observed, complementing previous light intensity measurements reported in the literature.
authors.affiliation: Department of Aerospace and Mechanical Engineering, Boston University, Boston, MA 02215, USA. crt@bu.edu
authors.forename: Charles R
authors.initials: CR
authors.lastname: Thomas
authors.forename: Ronald A
authors.initials: RA
authors.lastname: Roy
authors.forename: R Glynn
authors.initials: RG
authors.lastname: Holt