Theory of light emission in sonoluminescence based upon transitions in confined atoms
Dipartimento di Fisica “G.Galilei" and Istituto
Nazionale di Fisica Nucleare, via Marzolo 8, 35131 Padova, Italy
Revised: 23 June 2004
Published online: 3 May 2005
A theory of light emission in sonoluminescing hydrogen bubbles, based upon transitions in confined atoms, is proposed. Despite the simplicity of the assumptions this model accounts for a number of facts related to sonoluminescence: a broadband spectrum in the correct wavelength window is predicted as well as the number of emitted photons. Taking the temperature at the moment of collapse as a parameter we argue that confined atomic transitions at 4000 K may account for the observed light emission. This result favours a `cold' interpretation of sonoluminescence in contrast to previous theories. Many considerations are qualitatively extendible to rare gases.
PACS: 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005