Nature of the “Extreme Conditions” in Single Sonoluminescing Bubbles

Lepoint-Mullie, Françoise; Pauw, Damien De; Lepoint, T.; Supiot, Philippe; Avni, R.

doi:10.1021/jp9908395

Cited by 1 publication

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“…LepointMullie et al [35] performed a plasma diagnostics analysis on the experimental spectrum of a single Ar bubble in water to estimate the electron density. However, the plasma considered was up to now taken as at equilibrium (at least at local thermodynamic equilibrium) due to collision rates (determined by the very high density and temperature reached at collapse) estimated below a picosecond [36].…”

Section: Sonoluminescence As a Probe Of Intrabubble Conditionsmentioning

confidence: 99%

Toward a new paradigm for sonochemistry: Short review on nonequilibrium plasma observations by means of MBSL spectroscopy in aqueous solutions

Nikitenko

Pflieger

2017

Ultrasonics Sonochemistry

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This review summarizes recent studies of multibubble sonoluminescence (MBSL) in aqueous media in order to highlight new insights into the origin of the sonochemical activity. The observation of OH(CΣ-AΣ) emission band and a spectroscopic analysis of OH(AΣ-XΠ) emission band in MBSL of water pre-equilibrated with noble gases revealed the formation of a nonequilibrium plasma inside the collapsing bubble (T>T>T, where T is an electron temperature, T is a vibrational temperature and T is a rotational (gas) temperature). The T and T estimated using OH(AΣ-XΠ) emission band increase with ultrasonic frequency. In Xe the T of OH(AΣ) state is much higher than in Ar most probably due to the lower ionization potential of Xe. The MBSL of C Swan band (dΠ-aΠ) measured in aqueous tert-butanol (t-BuOH) solutions correlates with the data obtained for OH(AΣ-XΠ) emission band. Analysis of the gaseous products of t-BuOH sonolysis revealed a significant sonochemical activity even at high t-BuOH concentration when MBSL is totally quenched, indicating that drastic intrabubble conditions (plasma) are not necessarily accompanied by sonoluminescence. The nonequilibrium plasma model of cavitation allows to explain the reverse carbon isotope effect observed during the sonolysis of water in the presence of Ar/CO gas mixture.

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Section: Sonoluminescence As a Probe Of Intrabubble Conditionsmentioning

confidence: 99%