title: Correlation between Na* emission and "chemically active" acoustic cavitation bubbles.
abstract: The emission from electronically excited sodium atoms (Na*) from aqueous solutions containing NaCl or sodium dodecylsulfate under ultrasonic irradiation is studied. Evidence is presented that strongly suggests Na* emission arises from a population of bubbles that are sonochemically active but not producing sonoluminescence (SL). Results indicate that the Na* emission intensity is mainly dependent on the concentration of Na(+) ions near the bubble/solution interface. The results provide further insight into the origin of alkali metal spectral line emission from sonicated aqueous solutions containing sodium ions.
authors.affiliation: Particulate Fluids Processing Centre, School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia.
authors.forename: Devi
authors.initials: D
authors.lastname: Sunartio
authors.forename: Kyuichi
authors.initials: K
authors.lastname: Yasui
authors.forename: Toru
authors.initials: T
authors.lastname: Tuziuti
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Kozuka
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Iida
authors.forename: Muthupandian
authors.initials: M
authors.lastname: Ashokkumar
authors.forename: Franz
authors.initials: F
authors.lastname: Grieser