Molecular emissions in sonoluminescence spectra of water sonicated under Ar-based gas mixtures

R Pflieger; E Fayard; C Noel; S I Nikitenko; T Belmonte

doi:10.1016/j.ultsonch.2019.104637

Molecular emissions in sonoluminescence spectra of water sonicated under Ar-based gas mixtures

Ultrason Sonochem. 2019 Nov:58:104637. doi: 10.1016/j.ultsonch.2019.104637. Epub 2019 Jun 11.

Authors

R Pflieger¹, E Fayard², C Noel³, S I Nikitenko², T Belmonte³

Affiliations

¹ Institut de Chimie Séparative de Marcoule, ICSM UMR 5257 - CEA, CNRS, Univ Montpellier, ENSCM, Bagnols-sur-Cèze Cedex, France. Electronic address: rachel.pflieger@cea.fr.
² Institut de Chimie Séparative de Marcoule, ICSM UMR 5257 - CEA, CNRS, Univ Montpellier, ENSCM, Bagnols-sur-Cèze Cedex, France.
³ Université de Lorraine, Institut Jean Lamour, UMR CNRS 7198, Nancy, France.

PMID: 31450313
DOI: 10.1016/j.ultsonch.2019.104637

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.

Keywords: Emission spectra; Plasma; Sonochemistry; Sonoluminescence; Ultrasound.