Suslick K S, Flint E B
School of Chemical Sciences, University of Illinois at Urbana-Champaign 61801.
Nature. 1987;330(6148):553-5. doi: 10.1038/330553a0.
Our understanding of the chemical effects of high-intensity ultrasonic irradiation of liquids is still quite limited. It is generally accepted that sonochemistry results from acoustic cavitation: the creation, growth, and implosive collapse of bubbles in ultrasonically irradiated liquids. The mechanism of sonoluminescence in aqueous systems has been a matter of some dispute; recent discussions have suggested at least three possible origins: black-body emission, chemiluminescence from radical recombination, and electric discharge. Few studies of non-aqueous sonoluminescence, however, have been conducted. We present here the first spectrally resolved sonoluminescence spectra from hydrocarbon and halocarbon liquids. These spectra originate unambiguously from excited-state molecules created during acoustic cavitation. These high-energy species probably result from the recombination of radical and atomic species generated during the high temperatures and pressures of cavitation.
我们对高强度超声辐照液体的化学效应的理解仍然相当有限。人们普遍认为，声化学源于声空化：在超声辐照的液体中气泡的产生、生长和内爆崩溃。水体系中声致发光的机制一直存在一些争议；最近的讨论提出了至少三种可能的起源：黑体辐射、自由基复合产生的化学发光和放电。然而，对非水声声致发光的研究很少。我们在此展示了来自烃类和卤代烃液体的首个经光谱解析的声致发光光谱。这些光谱明确源自声空化过程中产生的激发态分子。这些高能物种可能是在空化的高温高压下产生的自由基和原子物种复合的结果。
