Careful re-examination of typical experimental data made it possible to showthat the UV continua observed in multi-bubble (MBSL) and single-bubble (SBSL)sonoluminescence spectra have the same physical nature - radiative dissociationof electronically excited hydrogen molecules [and probably hydrides of heavyrare gases like ArH*] due to spontaneous transitions between bound andrepulsive electronic states. The proposed mechanism is able to explain allavailable spectroscopic observations without any exotic hypothesis but in termsusual for plasma spectroscopy.
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