Luminescence kinetics of two-component molecular systems in porous glasses

The kinetics of bimolecular photoreactions accompanied by a characteristic delayed emission of reactant molecules is studied in nanoporous silica glasses upon selective activation of a two-component luminophore system (erythrosine-anthracene) by a short (10 ns) pulse of a Nd³⁺:YAG laser (532 nm). Time-resolved luminescence signals with different shapes are recorded in different spectral regions. The emission at a wavelength of 430 nm is identified as the sensitized delayed annihilation fluorescence of anthracene. The long-time luminescence in the region of 570 nm consists of thermally induced delayed fluorescence of erythrosine and an emission resulting from heterogeneous annihilation of triplet excitations of erythrosine and anthracene. The effect of pore sizes on the triplet-triplet energy transfer efficiency is determined.     

Classical demonstration experiments on electricity and magnetism at the faculty of physics of Moscow State University

Lecture demonstrations are the most important phenomenological component of the general physics course. Many of them have been undeservedly forgotten or replaced with virtual experiments. In this paper, a number of experiments are considered, which most clearly illustrate the magnetic action of an electric current, interaction of currents, properties of magnets, phenomenon of electromagnetic induction, and principles of transformer operation.     

IR spectroscopy of the acetonitrile molecules in porous glasses

The results of investigation of the IR spectra of optical density under the condition of attenuated total internal reflection of acetonitrile in porous glasses with the pores of different radii are presented. It is established that interaction between the acetonitrile molecules and the porous glass matrix with the pores of small dimensions (1.3–4 nm) significantly effects the spectral characteristics of these molecules.     

IR Spectroscopy of Bidistilled and Deuterium Water under Conditions of Geometric Limitation in Glass Nanopores

Optics and Spectroscopy - A study of IR spectra of H2O and D2O in nanoporous glass (PG) matrices with pores of different sizes has been carried out under geometric confinement. It has been...