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3 March 1997 Collision-induced emission at high temperatures and densities: modeling of the sonoluminescence spectra
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Proceedings Volume 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy; (1997) https://doi.org/10.1117/12.267783
Event: 12th Symposium and School on High Resolution Molecular Spectroscopy, 1996, St. Petersburg, Russian Federation
Abstract
It is well known that infrared inactive gases, such as nitrogen and hydrogen, absorb infrared radiation if the gas densities are sufficiently high. The absorption is of a supramolecular nature, involving dipole moments induced by exchange, overlap, and dispersion forces as well as by multipole induction in pairs, triples, . . . of interacting molecules. The same collision-induced dipoles also emit radiation in the infrared and, at sufficiently high temperatures, also in the visible and near ultraviolet. We have estimated the intensities and the spectral profiles of binary emission spectra of nitrogen and nitrogen-argon mixtures for conditions believed to be representative for the converging spherical shockwaves of sonoluminescence, e.g., for densities of several times 1021 molecules per cubic centimeters and temperatures of tens to hundreds of thousands of kelvin. Remarkably, the calculated profiles and intensities reproduce the measurements of such spectra in detail in the spectral range from 200 to 700 nm, the window of water, where the spectra are known. The sonoluminescence source is shown to be optically thin.
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Lothar Frommhold "Collision-induced emission at high temperatures and densities: modeling of the sonoluminescence spectra", Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); https://doi.org/10.1117/12.267783
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