We demonstrate that anti-Stokes excitation of Mn²⁺ ions in CsMnCl₃ ^. 2H₂O crystal is possible through multi-phonon addition to the energy of the photons of exciting light. The deficit dE between the energy of the Mn^{2+ 4}T₁ exciton and the photon energy of the He - Ne laser used as the source of illumination is compensated by simultaneous annihilation of several thermally activated lattice phonons. The absence of two-photon activation of the fluorescence was verified by measurement of the dependence of the fluorescence intensity on the intensity of the exciting light, which appears linear at fixed energy mismatch dE.

• Єременко Віктор Валентинович (1932–2017) (фізико-математичні науки)

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