Pavlovich V.S.,Military Academy of the Republic of Belarus
Journal of Applied Spectroscopy | Year: 2014
The theory of nonradiative transitions, based on the model of orientational broadening of electronic levels, is used to interpret known data on the effect of the polarity of the medium and temperature on the lifetime of the S1(Ag −) state for 12′-apo-β-caroten-12′-al and 8′-apo-β-caroten-8′-al. The effect of promoting vibrations on the rate constant for nonradiative transitions is considered. The results make it possible to hypothesize that the internal electric field created by the environment strongly perturbs the pigment molecules. Consequently, in the excited S1(Ag −) state, both pigments exist as different conformers I and II. Their structures differ by a 180° rotation of the cyclohexene ring relative to the polyene chain. Conformer II predominates in polar media, and is found in an intramolecular charge-transfer state S1(Ag −/ICT). In addition, as a result of fluctuations in the internal electric field, it can also be found in a charge-separated state S1(Ag −/CS). © 2014, Springer Science+Business Media New York.
Gladkov L.L.,Higher State College of Communications |
Khamchukov Y.D.,National Academy of Sciences of Belarus |
Sychev I.Y.,National Academy of Sciences of Belarus |
Lyubimov A.V.,RAS Semenov Institute of Chemical Physics |
Gladkova G.A.,Military Academy of the Republic of Belarus
Journal of Applied Spectroscopy | Year: 2015
The structures of four stereomers (enantiomers) of photochromic indolinospirobenzothiopyran (ISTP) in the closed form were studied by the DFT method. The most stable structure was found. IR spectra of ISTP in KBr pellets and as a film on single-crystalline KBr plates (in the region 400–4000 cm−1) and as a powder between polyethylene plates (100–400 cm−1) were measured. An interpretation of the obtained IR spectra was proposed. Specific features of normal modes of ISTP caused by the presence of the spiro center were revealed. © 2015 Springer Science+Business Media New York
Cherkas N.L.,Military Academy of the Republic of Belarus |
Cherkas S.L.,Institute for Nuclear Problems
Crystallography Reports | Year: 2016
An empirical formula is derived to describe the quasi-periodic structure of a layer of porous aluminum oxide obtained by anodization. The formula accounts for two mechanisms of the transition from the ordered state (2D crystal) to the amorphous state. The first mechanism infers that vacancy-type defects arise, but the crystal lattice remains undestroyed. The second mechanism describes the lattice destruction. The radial distribution function of the pores in porous aluminum oxide is obtained using the Bessel transform. Comparison with a real sample is performed. © 2016, Pleiades Publishing, Inc.
Voropaev Yu.P.,Military Academy of the Republic of Belarus |
Vasil'Ev A.D.,Military Academy of the Republic of Belarus |
Meshcheryakov I.M.,Military Academy of the Republic of Belarus
Journal of Communications Technology and Electronics | Year: 2013
The results obtained of the authors in previous studies based on matrices T and new objective functions and matrices, which are used in the structural-parametric synthesis of wideband matching devices in the multicascade connections of two-ports, are generalized. The examples of solving test problems are presented. © 2013 Pleiades Publishing, Ltd.