An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

In this work, nanostructured diamond particles are considered as fillers for epoxy coatings. Nanodiamonds and a diamond charge obtained as a result of detonation synthesis from a mixture of TNT and hexogen are characterized by IR spectroscopy, scanning electron microscopy, and thermal analysis. It has been shown that nanodiamonds are characterized by thermal stability up to 450°C and increase the thermal stability of epoxy coatings. The influence of nanodiamonds and diamond charge, depending on their quantity and synthesis conditions, on the physical and mechanical properties (hardness, contact angle, adhesion, impact and bending strength) of epoxy coatings is studied. The results of a study of the anticorrosion resistance of epoxy coatings with 10 wt

The luminescence excitation spectra of the D 1 resonance line of atoms K, Rb, and Cs in gas mixtures with CF 4 are found to contain satellite transitions, which correspond to the transition of an atom to the states ( n – 1) d 2 D 3/2,5/2 and ( n + 1) s 2 S 1/2 , where n = 4, 5, and 6 for K, Rb, and Cs, respectively, with the simultaneous excitation of CF 4 molecule vibrations at the IR active mode frequency ν 3 with a quantum energy of 1283 cm –1 . These satellite transitions are A( ns 2 S 1/2 ) + CF 4 (ν 3 = 0) + h ν → A(( n – 1) d 2 D 3/2,5/2 ) + CF 4 (ν 3 = 1) and A( ns 2 S 1/2 ) + CF 4 (ν 3 = 0) + h ν → A(( n + 1) s 2 S 1/2 ) + CF 4 (ν 3 = 1), where A = K, Rb, and Cs. The appearance of an optical coupling between the upper and lower states of these asymptotically (at R_A - CF_4 → ∞) forbidden transitions is shown to be caused by the interaction of the dipole moment of the ν 3 = 1 ↔ ν 3 = 0 vibrational transition in the CF 4 molecule with the dipole moments of the electronic transitions np 2 P 1/2,3/2 ↔ ( n – 1) d 2 D 3/2,5/2 and np 2 P 1/2,3/2 ↔ ( n + 1) s 2 S 1/2 in an alkali metal atom; as a result of this interaction, the upper state of the satellite transition acquires admixtures of the A( np 2 P 1/2,3/2 )CF 4 (ν 3 = 0) resonance states.

New N-isopropyl-N',N'-diphenyl-N-(silylmethyl)ureas were obtained, and their structure was explored by 1H, 13C, 29Si NMR spectroscopy and X-ray analysis. These results have shown that N-isopropyl-N', N'-diphenyl-N-[(fluorosilyl)-methyl]ureas exist as (O–Si) chelates with intramolecular dative bond C=O→Si.

Novel N-isopropyl-N',N'-dimethyl-N-(silylmethyl)ureas Me2NC(O)N(Pri)CH2SiMenX3–n (X = OEt, F; n = 0–2) were synthesized, and their structure was confirmed by 1H, 13C and 29Si NMR spectroscopy. According to NMR data, the silicon atom of the fluorosilanes (X = F) is pentacoordinated. The X-ray diffraction analysis of the (trifluorosilyl)methylcontaining urea showed that it exists as (O–Si) chelate with intramolecular dative bond C=O→Si (1.880 Å).

Thin films with the uniaxial magnetic anisotropy were synthesized by Fe+ implantation into single-crystal silicon in the external magnetic field. The induction of the magnetic anisotropy is due to the directional atomic pair ordering (Néel-Taniguchi model). The applicability of this model is confirmed by experiments on the rotation of the direction of the easy magnetization axis by repeated low-dose implantation in an external magnetic field. The induced anisotropy is formed in the collisions cascade region characterized by the so-called «dynamic temperature». The value of the dipole interaction coefficient, calculated taking into account the dynamic temperature, agrees with the results obtained in other works. The value of anisotropy constant is inversely proportional to temperature. Possible mechanism leading to such dependency is discussed.

The excitation spectrum of the resonance luminescence of Na atoms in a mixture with CF4 exhibits a satellite transition corresponding to the simultaneous optical excitation of the colliding atom and molecule, Na(2S1/2) + CF4( $${{v}_{3}}$$ = 0) + h $$v$$ → Na(2P1/2, 3/2) + CF4( $${{v}_{3}}$$  = 1), where $${{v}_{3}}$$ is the infrared active mode of CF4 with a vibrational quantum energy of 1283 cm–1. It is shown that the optical coupling between the upper and lower states of this asymptotically $$({{R}_{{{\text{Na}} - {\text{C}}{{{\text{F}}}_{4}}}}} \to \infty )$$ forbidden transition can be explained within a model that takes into account the polarization of the atom in the field of the molecule and the interaction of the dipole moment of the CF4( $${{v}_{3}}$$  = 1 ↔  $${{v}_{3}}$$  = 0) transition with the dipole moments of electronic transitions in the atom. The results of calculations based on this model are in satisfactory agreement with the experiment. It is noted that CF4 may be of interest as a component of a working medium of diode pumped alkali lasers.

The absorption and luminescence excitation spectra of gas phase mixtures of alkali metals atoms A (A = K, Rb, Cs) with carbon tetrafluoride molecules CF4 are studied in the region of transitions from the ground state A(S-2(1/2)) to the lowest resonance states A(P-2(1/2,3/2)). It is shown that these transitions have intense satellites corresponding to the simultaneous vibrational excitation of the carbon tetrafluoride molecule, A(S-2(1/2)) + CF4(v(3) =0) + hv -> A(P-2(1/2,3/2)) + CF4(v(3)=1), where v(3) is the IR active mode of CF4 with a vibrational quantum energy of 1281 cm(-1). The satellites are relatively narrow bands (FWHM 30 cm(-1)) slightly (< 10 cm(-1)) shifted to the red from the energies corresponding to the asymptotes A(P-2(J)) + CF4 (v(3)=1), J=1/2, 3/2. The spectral width and position of the satellites indicate that these transitions occur at relatively large atom-molecule distances. In contrast to the majority of the studied before pair excitation processes in the gas phase, the intensity borrowing mechanism responsible for the observed satellite bands cannot be explained by the dipole-dipole interaction. Possible alternative mechanisms are discussed. It is also established that mixtures with CF4 are chemically stable including at elevated temperatures up to at least 200 degrees C and their optical excitation results in resonance luminescence of alkali atoms. As compared to Ar, collisions with CF4 provides a higher rate of the population transfer between the A(P-2(1/2)) and A(P-2(3/2)) states. These results indicate that CF4 may be used as a component of the active medium of diode pumped alkali lasers. (C) 2020 Elsevier Ltd. All rights reserved.

The RADEX pulsed neutron source based on a linear proton accelerator at the Institute for Nuclear Research, the Russian Academy of Sciences, has one vertical channel with a 4-m path length and three horizontal channels with path lengths of approximately 10, 20, 30, and 50 m. The source is characterized by an unconventional configuration: the target and the water moderator are located perpendicularly to the proton beam; as a result, the neutron spectrum is enriched with epithermal and cascade neutrons. Using the source, investigations in the fields of nuclear physics, condensed-matter physics and nanostructures can be performed. The results obtained using various path lengths of horizontal channels of the RADEX neutron source are presented. Test measurements are conducted and direct beam spectra for the horizontal neutron channels and neutron diffraction patterns of test samples are obtained. The resolution for different path lengths of the neutron source is determined. The possibility of performing phase analysis is demonstrated.

•The thin iron silicide film ion-beam synthesized under external stress.•The region with relatively high external tensile stress is magnetically anisotropic.•The anisotropy field is proportional to the stress applied during implantation.•The coercive force in isotropic regions increases with decreasing external stresses.

40 keV iron ions have been implanted into single-crystal silicon wafers at room temperature. As a result, thin iron-silicide films were synthesized in the near-surface region of substrates. Scanning magnetooptical Kerr effect studies showed that some films had the uniaxial magnetic anisotropy. The coercive force determined in the direction of the easy magnetization for films with the magnetic anisotropy increased with the increase in the implantation fluence. However, ferromagnetic samples became isotropic when the dose of the order of 2.6×1017 cm–2 was reached. Ferromagnetic resonance studies showed that the resonance linewidth in isotropic samples increased with the temperature decrease. It was found that the ferromagnetic resonance linewidth for samples with the uniaxial anisotropy was less than that for isotropic ones. The observed behavior of resonance spectra can be explained on the basis of the model taking into account the effect of thermal fluctuations of the resonance line shape in disperse ferromagnets.

В Институте ядерных исследований РАН (г. Троицк) введен в эксплуатацию импульсный нейтронный источник ИН-06 (spallation source). Измерены спектры нейтронов прямых пучков экспериментальных каналов импульсного источника, предназначенного для исследований конденсированных сред, наносистем и функциональных материалов. Cравнение расчетных и экспериментальных нейтронных спектров показывает их хорошее совпадение. Приводятся данные по плотности нейтронных потоков при заданных параметрах работы линейного ускорителя протонов, являющегося драйвером нейтронного источника ИН-06.

The cross section for the neutron-induced fission of 241Am at neutron energies between 0.2 eV and 10 keV was measured by means of a lead slowing-down spectrometer (LSDS-100). The parameters of the intermediate structure in the behavior of the fission strength function were estimated.

Fe 3 Si ferromagnetic thin films are synthesized by iron ion implantation into single-crystal Si(111) and Si(100) wafers. The ion dose dependence of the magnetic properties of the iron-silicide thin films is investigated in detail by the magnetooptical Kerr effect. Magnetically isotropic and anisotropic films are formed, depending on the ion-beam synthesis conditions. The film coercivity increases with implantation dose. According to the results of X-ray analysis, the magnetically isotropic samples with an average crystallite size of 20–30 nm exhibit higher crystlallinity as compared with the magnetically anisotropic films. The results obtained show that the magnetic properties of both the isotropic and anisotropic samples can be described within the random anisotropy model. It is established with increasing ion implantation dose that the magnetocrystalline anisotropy of randomly oriented crystallites compete with the induced uniaxial anisotropy, up to suppression of the latter.