A holographic method for studying annihilation of optically excited molecular states is proposed. The method is based on detection of the relaxation kinetics of periodically distributed photochromic centers by measuring the intensity of the diffracted, reading laser beam. The exact analytic expressions are obtained for intensities of the first- and second-order diffraction maxima, which determine the distortion kinetics of the initially sinusoidal grating profile. The intensity of the second-order maximum is a nonmonotonic function of time and has a characteristic extremum. The dependence of the diffraction efficiency of a hologram on the annihilation parameters is established.
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