Resolving single bubble sonoluminescence flask width

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Arakeri, Vijay H (1998)
  • Publisher: Indian Academy of Sciences
  • Subject: Mechanical Engineering

Single bubble sonoluminescence (SBSL), first studied and observed by Gaitan et al., is the of light emission from a single gas bubble trapped at the pressure maximum of a resonant sound field in a liquid medium, generally water. One of the most striking aspects of SBSL was the estimated optical flash width being less than 50 picoseconds (ps)3; this upper estimate was based on the relative response of a SBSL flash in comparison to a 34 ps laser pulse using a microchannel platephotomultiplier tube (MCP-PMT). Moran et al., put the estimate to be less than 12 ps using a streak camera; however, there have been some questions raised on the accuracy of these measurements. Most recently, two groups, Gompf et al., and Hiller et al., have resolved the optical flash width of SBSL using Time-Correlated Single Photon Counting (TC-SPC) technique which is well established in fluorescence decay time measurements. We first summarize the results from these two contributions, then briefly describe the technique and finally consider the implications of this important new development.
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