Physics

Power Range of Photoneutrons from 209Bi at Е γmax = 12 MeV

Authors: Belyaev S. N., Klochkov M. A., Nechkin A. A., Sidorov V. I.

On a bunch of brake radiation of the betatron the power range of photoneutrons from 209Bi is measured. Measurements are executed by means of a scintillation spectrometer on the basis of a stilbene crystal with discrimination γ-radiations in an impulse form. The obtained data are compared with known of literature and analyzed on the basis of evaporation model.

Range of Gamma Quanta in the Beryllium Target

Authors: Zalesny G. N., Klochkov M. A.

Changes of an initial brake range of gamma quanta in a sample are analysed. It is shown that the main mechanism influencing g quanta range form in a sample of beryllium is Compton’s effect. In work this amendment is considered in the analysis of an exit of photoneutrons. However unlike the models considered in other works at the accounting of Compton dispersion parametrization isn’t used.

Creating and Fluorescence of the Multilayer Langmuir – Blodgett Films of CdSe/CdS/ZnS Quantum Dots

Authors: Gorbachev I. A., Shtykov S. N., Glukhovsky E. G.

Multilayered structures composed by Langmuir – Blodgett films of CdSe/CdS/ZnS quantum dots functionalized by oleic acid and fluorescent at 525 and 631 nm were prepared and studied by fluorescent spectroscopy. It was shown that fluorescent spectra of the nanosized multilayered film consisting of different QD layers have complex character and can be rearranged with relative positions of QD layer and laser beam that open possibility to operate the fluorescent intensity of every QD layer.

Тhе Quasipotential Approach to the Syperfine Splitting of Muonic Hydrogen and Positronium

Authors: Boykov A. A., Baykova N. A.

For the description of the two-partial atoms spectrum in quasipotential approach the relativistic amplitude is used. The interrelation of scattering amplitude expressions, corresponding to quantovoelektrodinamic corrections in various orders is traced. Arising from the accounting of delay effect the additional logarithmic corrections of the sixth order to the constant of fine structure in the bound level superfine shift are analyzed.

Fluorescent Properties of Quantum Dots During Silanization Process

Authors: Goftman V. V., Vostrikova A. M., Goryacheva I. Y.

Quantum dots (QDs) are fluorescent semiconductor nanoparticles with unique optical properties. For bioapplication QDs have to be water-soluble. Here we describe one of common hydrophilization approaches – ligand exchange on silica precursors molecules and investigate fluorescent properties during this process.

Microwave Absorption Spectra and Resonance Frequencies of a «Magnetic Nanocomposite Coating – Microstrip Line» Structure

Authors: Voronin D. V., Beginin E. N.

This paper aims to look into microwave absorption spectra of «mag-netic nanocomposite coating – microstrip line» structure, containing magnetite Fe3O4 nanoparticles. The resulted spectra allowed to define the specific resonance frequencies of the structure under investiga-tion and to figure out the material parameters of the nanocomposite coating, that are, an effective magnetization, a volume fraction of magnetic nanoparticles in the coating as well as a magnetic crystal-line anisotropy filed.

The influence of Morphology, Conditions of Production and External Effects on Nanoparticles’ (in Terms of Iron) Dielectric Properties

Authors: Belenko D. I., Therin D. V., Tozkoparan O., Ildyrym O., Galushka V. V., Dinker I., Dobrinsky E. K., Ellerman Y., Venig S. B.

It was shown that the complex research of iron nanoparticles properties by different methods, supplemented each other, permit to receive the data about the interior sizes of nanoparticles, a number of physical properties of particles, their dependence on frequency and changes produced by various influences. It was found that the conductivity of nanoparticles changed under the square dependence σ = σo*ω2.

The Manifestation’s Research of the Pair Association in the Pyridine’s Ir-Spectrums by the Matrix Isolation Technique

Authors: Berezin K. V., Nechaev V. V., Kozlov O. V., Novoselova A. V., Chernavina M. L., Berezin V. I., Berezina M. K., Novoselov V. V.

The calculation of structure, frequencies of normal fluctuations and the strips intensity in IR-spectrums of five dimer of pyridine with hydrogen communication  has been performed by the matrix solation technique B3LYP/6-311+G (d, p). The number’s modeling of the difficult oscillatory contours in the pyridine’s IR-spectrum was executed taking into account the intermolecular interaction.

Surface Electromagnetic Waves in the of Optical Range (Surface Plasmon Polaritons – Spps): Their Properties and Applications

Authors: Nazvanov V. F.

Surface plasmon polaritons (SPPs) are electromagnetic excitations, in wich electromagnetic field in dielectric is coupled to collective electron oscillation in metal, and propagate along and is tightly bound to metal/dielectric interfaces. First, we present an overview of SPPs in the optical range and their applications in optoelectronics and sensorics. We further present the main research results achived by the author in this area.

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