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Updated: Jan 20, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
Published on: August 27, 2019
Molecular emissions in sonoluminescence spectra of water sonicated under Ar-based gas mixtures
R Pflieger1, E Fayard1, C Noel2
1Institut de Chimie Séparative de Marcoule, ICSM UMR 5257 - CEA, CNRS, Univ Montpellier, ENSCM, Bagnols-sur-Cèze Cedex, France.
Abstract:
Sonoluminescence (SL) spectroscopy is one of the very few ways to study the plasma formed in solutions submitted to ultrasound. Unfortunately, up to now only very limited emission bands were reported in SL spectra of aqueous solutions, moreover broad and badly resolved. It is shown here that by adding some N2 and/or CO2 in Ar, new molecular emissions (CN, N2 and CO) can be observed and that for some of them rovibronic temperatures can be derived. The paramount importance of Stark broadening in these emissions is underlined, together with the need for data on Stark parameters for molecular emissions.
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