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.
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