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1.
A. A. Chistyakov I. L. Martynov K. E. Mochalov V. A. Oleinikov S. V. Sizova E. A. Ustinovich K. V. Zakharchenko 《Laser Physics》2006,16(12):1625-1632
The optical properties of CdSe/ZnS semiconductor nanocrystals with the core-shell structure are studied upon visible-laser excitation in a wide range of flux densities. It is demonstrated that the dimensional quantization effect is preserved in the films with a limiting high concentration of nanocrystals. A strong bathochromic shift of the absorption and luminescence peaks relative to the peak positions in the corresponding spectra of nanocrystals in films with a relatively low concentration of nanocrystals and solutions is caused by a high concentration of nanocrystals and the dipole moment related to the asymmetry of the nanoparticles. The shift is varied from 35 to 50 nm depending on the film thickness. The luminescence spectra of the films remain unchanged upon an increase in the laser intensity to 1 × 106 W/cm2. The laser action on the nanoparticle films is studied at intensities (5 × 106?1 × 109 W/cm2) higher than the damage threshold. 相似文献
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Reactions of alkoxydimethylsilyl cyanides with some chlorides of tricoordinated phosphorus (phosphorous chlorides) have been studied. It is shown that, depending on the nature of the phosphorous chloride, the chlorine atoms can either be substituted only for cyano groups, or for alkoxy and cyano groups simultaneously. The results obtained in this work clearly show that alkoxydimethylsilyl cyanides are more reactive reagents for attaching cyano groups to a phosphorus atom than trimethylsilyl cyanide.For Part 1, see [1].For a preliminary communication, see [2].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2847–2849, December, 1991. 相似文献
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A theory of the crystalline state of matter is constructed in the framework of the method of distribution functions. The system of two exact equations for the single- and two-particle distribution functions is solved by a series expansion in powers of the small parameter =(n-n
o)/n
0, wheren is the density of the crystal andn
0 is the density of the liquid at its crystallization point. In the zeroth order in , the theory leads to the Ornstein-Zernike equation, which determines all the properties of the molten state; in the first order, it leads to equations that determine the symmetry type of the crystal and the main lattice periods. Finally, in the second order in the theory makes it possible to calculate the jump in the density on crystallization of the molten state. The proposed method of solution is valid only at temperatures above the triple point, i.e., in the region in which the crystal can be in equilibrium with the molten matter.Institute of Physical Chemistry, USSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 90, No. 1, pp. 113–127, January, 1992. 相似文献
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S. V. Tikhov V. I. Danilov I. A. Karpovich V. V. Martynov 《Russian Physics Journal》1982,25(9):848-851
The properties of metal (Al, Au)-anodic oxide-CdSnAs2 monocrystal structures are studied. It is established that MOS-structures using undoped CdSnAs2 crystals show a high positive fixed charge in the anodic oxide (NS 5·1012 cm–2) and high surface state density on the oxide-CdSnAs2 boundary surface (NSS 2·1013 cm–2·eV–1). In MOS-structures using diffusion-doped (copper) crystals the sign of the fixed charge is negative (NS 1011 cm–2, NSS 2·1012 cm–2·eV–1). The latter structures show a definite photosensitivity and photomemory. The possibility of effective control of the fixed charge value within the oxide by illumination is shown. The surface state distribution over energy, time constant, and capture section is determined.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 90–93, September, 1982. 相似文献
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A. P. Tomilov B. I. Martynov V. V. Turygin A. V. Hudenko I. N. Chernyh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1)
Abstract The straight synthesis of organophosphorus compounds on the base of white phosphorus may solve a lot of problems concerning with simplification technology proceeding as a whole. At present time we are investigating procedures for the electrochemical generation of organophosphorus compounds directly white phosphorus The ability to carry out this type of procedure in single step will have considerable environmental benefits. Thus procedure affording trialkylphosphates in a yield more than 90% and purity up to 98% for row material in undivided cell has been elaborated. 相似文献
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V. I. Golovanov D. M. Mazo A. P. Martynov K. F. Shipilov 《Physics of Wave Phenomena》2016,24(4):301-304
The microwave propagation in a 3D dielectric photonic crystal at the frequency range from 8.5 to 12GHz has been investigated. A frequency range where effective refractive index n ef of the crystal approaches zero is found. In the frequency range where n ef <0.2, themicrowave beam becomes collimated, sharpened, and free of diffraction noise. An excitation of a surface wave, propagating along the external surface of the structure, is revealed in same frequency range. This property of the photonic crystal structure can be used to screen and mask objects scanned by external radiation. 相似文献