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Single-bubble sonoluminescence (SBSL) spectra in H₂O show featureless continuum emission. From an acoustically driven, moving bubble in phosphoric acid (H₃PO₄), we observe very strong molecular emission from excited OH radicals (~310 nm), which can be used as a spectroscopic thermometer by fitting the experimental SBSL spectra to the OH A ²Σ⁺--X ²Π rovibronic transitions. The observed emission temperature (Tₑₘ) ranges from 6200 to 9500 K as the acoustic pressure (Pₐ) varies from 1.9 to 3.1 bar and from 6000 to >10 000 K as the dissolved monatomic gas varies over the series from He to Xe.
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Xu et al. (2010) studied this question.
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