title: Multibubble sonoluminescence pulses from Na atoms in viscous liquid.
abstract: Multibubble sonoluminescence pulses of Na and continuum emissions were measured from NaCl-ethylene glycol solution saturated with Xe at 28 kHz. The Na emission consisted of multiple-peak pulses and single pulses. The intrinsic pulse width estimated from single pulses was 0.37 ns, which differs from 10-165 ns obtained by previous work. High-speed shadowgraphs of bubble dynamics and high-speed movies (32000 fps) of sonoluminescence were observed. The observations suggest that the multiple-peak pulse is due to the superposition of single peaks resulting from bubbles fragmented from a characteristic bubble which repeats the fragmentation and coalescence. This phenomenon may be specific to viscous liquids.
authors.affiliation: Department of Physics, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki 214-8571, Japan. pkchoi@isc.meiji.ac.jp
authors.forename: Pak-Kon
authors.initials: PK
authors.lastname: Choi
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Sawada
authors.forename: Yuuta
authors.initials: Y
authors.lastname: Takeuchi