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Abstract: The inelastic high-energy photon scattering from helium-like ions in the metastable and states, which results in ionization accompanied by simultaneous excitation of the residual ion, is considered. The description is performed within the framework of nonrelativistic perturbation theory. The cross sections of the process for transitions into the ns states are deduced in the analytical form. The contributions of excitations into the nl states characterized by the angular momentum are negligibly small. A comparison of our results with those of approximate calculations is given. [Copyright &y& Elsevier]

The phenomenon of particle creation within a resonantly vibrating lossy cavity is investigated for the example of a massless scalar field at finite temperature. Leakage is provided by insertion of a dispersive mirror into a larger ideal cavity. Via the rotating wave approximation we demonstrate that for the case of parametric resonance the exponential growth of the number of created particles and the strong enhancement at finite temperatures are preserved in the presence of reasonable losses. The relevance for experimental tests of quantum radiation via the dynamical Casimir effect is addressed. [Copyright &y& Elsevier]