Parametric x-ray emission by crystals irradiated by an ultrasound wave

Abstract

The theory of formation of parametric x-ray emission by crystals acted upon by an ultrasound wave is considered. Analytic expressions are obtained for the angular and integral characteristics of the radiation in the cases of weakly and strongly absorbing crystals. The existence of ultrasound-excited extinction beats is predicted. It is shown that for certain ultrasound wave vectors the spectral-angular density of the parametric x radiation is resonantly enhanced (acoustoparametric resonance). The influence of ultrasound on the dependence of the parametric x radiation on the energy of the particles incident on the crystal is investigated.