Electron-ion bremsstrahlung spectra calculations for sonoluminescence.

The bremsstrahlung spectra arising from electron-ion collisions are calculated for temperatures from 5000 K to 40 000 K and wavelengths from 100 nm to 1000 nm, for the ions He+, Ne+, Ar+, Kr+, Xe+, H+, and O+, using Hartree-Fock-Slater potentials. The spectral intensities are expressed in terms of Gaunt factors, the ratios of the present quantum computation and existing semiclassical results. For the heavy rare gas ions Gaunt factors of up to 3 are obtained at wavelengths of 200 nm.

Microwave emission of sonoluminescing bubbles.

Kordomenos et al. have attempted to measure single bubble sonoluminescence (SBSL) emission in the microwave window of water in a band of frequencies ranging from 1.65 GHz to 2.

Light emission of sonoluminescent bubbles containing a rare gas and water vapor.

We present numerical simulations of sonoluminescent rare-gas bubbles in water, which account for (i) time variations of the water vapor content, (ii) chemical reactions, and (iii) the ionization of the rare gas and the H2O dissociation products. Peak temperatures exceed 10 000 K at densities of a few hundred amagat ( approximately 10(28) particles per m(3)). The gas mixture in the bubble is weakly ionized.