排序方式: 共有16条查询结果,搜索用时 29 毫秒
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We report external-cavity-controlled lasing in single crystal platelets of the ternary semiconductor ZnxCd1-xS. Synchronously-pumped mode-locked operation at wavelengths as short as 482.5 nm has been achieved. Output powers of 5 mW and pulse durations shorter than 10 ps have been obtained. 相似文献
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Butenko A. V. Galimov A. R. Meshkov I. N. Syresin E. M. Tolstikhina I. Yu. Tuzikov A. V. Philippov A. V. Khodzhibagiyan H. G. Shevel’ko V. P. 《JETP Letters》2021,113(12):752-756
JETP Letters - The results of the first run (December 2020) for the commissioning of the new superconducting synchrotron Booster at the Joint Institute for Nuclear Research are presented. Vacuum... 相似文献
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Induced absorption spectra in the range 200–900 nm at 77 and 290 K for Li2B4O7 single crystals, isotopically Li and B enriched are presented after irradiation of these crystals by thermal neutrons with fluence 1.8×1016 cm−2. The dependence of induced absorption spectra on the isotope composition was revealed: for 6Li210B4O7 and 7Li210B4O7 crystals intensive band in the region of 280–294 nm was observed. Under substitution of 7Li isotope by 6Li in the lithium tetraborate lattice no changes in the absorption spectra were observed. The nuclear reaction 10B(n,)7Li is proposed to be the main mechanism of formation of the radiation defects. 相似文献
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I. M. Dremin O. V. Ivanov V. A. Nechitailo V. P. Shevel’ko N. M. Sobolevskii A. V. Subbotin 《Journal of Experimental and Theoretical Physics》2004,98(2):322-333
The evolution of cascades of atomic displacements in solids is analyzed. The charge-exchange, ionization, and elastic scattering cross sections are calculated for the atoms and ions involved in cascade evolution. The effects due to the material density are taken into account. These results are used to perform the first Monte Carlo computations of cascades based on the knowledge of microscopic processes without invoking phenomenological potentials. The proposed approach is unique in that detailed characteristics of atomic processes are obtained by ab initio calculation and applied to analyze cascades of atomic displacements. Subcascade development is described, and a relation between the number of Frenkel pairs and the energy of the primary knock-on atom is found for a wide energy range. This provides a basis for characterizing the dose dependence of the hardening of reactor pressure vessel steel and for comparing the effects of primary radiation damage for fission and fusion reactors. 相似文献
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L. V. Serebrennikov A. V. Golovkin D. I. Davlyatshin V. F. Shevel’kov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2008,82(4):558-564
The paper presents the results obtained for the malonic aldehyde—hydrogen peroxide and β-oxobutanal—hydrogen peroxide systems. The systems were studied by IR spectroscopy in xenon matrices. The potential energy surfaces and vibrational spectra of the molecules that could occur in these systems were calculated quantum-chemically. As distinct from similar systems with monoaldehydes and α-dioxo compounds, the first stage of the reactions that occurred in the systems under consideration involved the decomposition of hydrogen peroxide with the formation of atomic oxygen, whose secondary reactions determined the set of reaction products. 相似文献
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The properties of filled skutterudites MFe4Sb12 (M = La, Ca, Na) have been analyzed using the nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) methods. Two lines have been observed on the 139La NMR spectrum of the LaFe4Sb12 compound and a substructure has been revealed in the 121Sb and 123Sb lines in the NQR spectra of LaFe4Sb12 and CaFe4Sb12. The concept of the partial static displacement of guest atoms (M) in LaFe4Sb12 and CaFe4Sb12 has been proposed. The ab initio calculations confirm this assumption as well as give the displacement of a guest atom and indicate the absence of the splitting of the 139La NMR line in the LaFe4Sb12 spectrum. 相似文献
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Yu. A. Teterin A. V. Sobolev I. A. Presnyakov K. I. Maslakov A. Yu. Teterin I. V. Morozov I. O. Chernyavskii K. E. Ivanov A. V. Shevel’kov 《Journal of Experimental and Theoretical Physics》2017,124(2):251-260
The structure of the outer and inner electron spectra of iron (2p, 3p, 3s, and 3d) and phosphorus (3s and 3p) atoms in FeP monophosphide is studied in detail by the X-ray photoelectron spectroscopy (XPS) method. On the basis of the analysis of the binding energy of electrons, as well as the parameters characterizing the structure of experimental spectra, a conclusion is made that Fe3+ (d 5) cations in FeP are stabilized in a state with intermediate value of the total spin (IS, S = 3/2). The range of values of intra-atomic parameters (10Dq, J H ) is established in which the consideration of the high degree of covalence of Fe–P bonds may lead to the stabilization of (FeP6)15– clusters in the IS state. 相似文献
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Yu. É. Borozdin E. D. Kazakov V. I. Luchin N. N. Salashchenko I. Yu. Tolstikhina V. V. Chernov N. I. Chkhalo A. P. Shevel’ko O. F. Yakushev 《JETP Letters》2008,87(1):27-29
The spectra of a laser plasma in the soft x-ray (0.8–0.95 nm) and vacuum ultraviolet (3–4 nm) ranges are recorded with the use of new focusing multilayer structures. It is demonstrated that the electron temperature of the light-element plasma produced by a laser pulse with an energy of ~1 mJ can be measured by using the relative intensities of the satellites and the lines of ions with different charges. 相似文献
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Crystal structure of α-Ag<Subscript>8</Subscript>S<Subscript>3</Subscript>SO<Subscript>4</Subscript>
T. A. Shestimerova A. S. Mityaev D. I. Davlyatshin A. V. Shevel’kov 《Moscow University Chemistry Bulletin》2012,67(1):13-18
The crystal structure of silver sulfide-sulfate α-Ag8S3SO4 was determined by X-ray powder diffraction data. The substance crystallizes in the tetragonal system and the space group P-4 with the unit cell parameters of α = 7.2032(4) Å, c = 5.1043(5) Å, Z = 1, R f = 5.55%, χ2 = 3.45. The layers in the structure of the compound formed by trigonal prisms of Ag6S connected to each other through the vertices are connected by the additional atoms of sulfur into a three-dimensional framework. Distorted tetrahedral anions of SO 4 2? are located in the cavities of the framework, the symmetry (D 2d ) of which was confirmed by the data of IR spectroscopy. 相似文献