The spectral and kinetic parameters of electron-pulse-initiated transient absorption of oxygen-doped CaF 2 crystals were studied using pulsed spectrometry with a nanosecond time resolution. It is shown that the formation of a M + A color centers in CaF 2 -0.01M%CaO crystals occurs by thermally activated diffusion of the vacancies. Activation energy of M + A color centers formation process of 0.4 eV is established.

We report on the results of experimental and theoretical investigation of the shape of an acoustic pulse generated in alkali halide crystals by a pulsed electron beam with a maximal electron energy of 0.28 MeV and an energy density of 0.10-0.65 J/cm 2 . It is found that the shape of the acoustic pulse for the given beam parameters substantially differs from the absorbed energy density profile. The formation of the fine structure of the acoustic pulse is associated with local release of energy due to the evolution of multichan nel electrical breakdown.

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