Correlation between Na* emission and "chemically active" acoustic cavitation bubbles.
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.
Sunartio
Devi
D
Particulate Fluids Processing Centre, School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia.
Yasui
Kyuichi
K
Tuziuti
Toru
T
Kozuka
Teruyuki
T
Iida
Yasuo
Y
Ashokkumar
Muthupandian
M
Grieser
Franz
F