期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 17, 页码 6060-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja900457v
关键词
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资金
- National Science Foundation
Intense Na* emission was observed from 0.1 M Na2SO4 in 95% sulfuric acid during multibubble sonoluminescence (MBSL). As a function of acoustic intensity, three different morphologies are observed for the cloud of light emitting bubbles. Even more strikingly, there is a spatial separation between blue-white emitting bubbles and orange emitting bubbles, easily observed by the naked eye. Surprisingly, no Na* emission was observed on the top of a bubble cloud (blue-white emission) while strong Na* emission predominates at the bottom. This observation provides the first experimental evidence to distinguish between the two types of two-site models of acoustic cavitation and MBSL: spatial separation of emission from nonvolatiles (e.g., Na*) ought not to be observed for the heated-shell model but is predicted from the injected droplet model.
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