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Yu. G. Abov D. S. Denisov N. O. Elyutin S. K. Matveev Yu. I. Smirnov A. O. Éidlin F. S. Dzheparov D. V. L’vov 《Journal of Experimental and Theoretical Physics》1998,87(6):1195-1200
The asymptotic behavior of the spectra for large values of the scattering vector for the case of elastic multiple small-angle
neutron scattering (SANS) is investigated theoretically and experimentally. An expansion of the spectrum in terms of the reciprocal
of the magnitude of the momentum transfer is obtained taking account of the influence of the instrumental line. It is shown
that, to within some factor, the leading term of the expansion is identical to the differential single-scattering cross section
averaged over a statistical ensemble of particles; several subsequent terms in the expansion are calculated and the range
of applicability of the resulting expressions is determined. The asymptotic behavior of the multiple SANS spectrum is measured,
using a two-crystal neutron spectrometer, for samples of an HTSC ceramic, the alloy Fe-Ni, and Al powder. The agreement between
the experimental results and the theoretical predictions is analyzed.
Zh. éksp. Teor. Fiz. 114, 2194–2203 (December 1998) 相似文献
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The study concerns the dynamics of a network of hydrogen bonds in small water clusters (on the example of hexamer and octamer clusters). The numerical experiment is carried out with the molecular dynamics method using two analytical rigid potentials TIP4P and TIP5P. According to the obtained results, the criteria of phase transitions provided by the cluster theory are not reliable enough in the case of small water clusters. This is testified by the distributions of potential energies of individual molecules in the clusters. It is shown that the appearance of several peaks in these distributions reflects the number of hydrogen bonds between the molecule and other molecules of the cluster. 相似文献
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A. I. Belogorokhov A. A. Florentsev I. A. Belogorokhov A. V. Elyutin 《Physics of the Solid State》2006,48(4):637-646
The lattice dynamics of CdxHg1-x-y ZnyTe solid solutions is studied theoretically and experimentally. The frequencies of the basic optical phonons of CdxHg1-x-y ZnyTe are calculated in terms of a modified random-element isodisplacement model. As a result, all basic vibrations of the crystal lattice that substantially affect the optical properties of this material in the spectral region corresponding to one-phonon resonance are identified. The optical properties of epitaxial CdxHg1-x-y ZnyTe layers grown by liquid-phase epitaxy on Cd1-x ZnxTe substrates are studied. The calculated and experimental spectral dependences of the dielectric function of CdxHg1-x-y ZnyTe solid solutions of various compositions are compared at 295 and 78 K, and good agreement between them is reached. The additional lattice vibrations whose frequencies in the phonon density of states are lower than that of the HgTe mode are shown to be caused by the lattice defects of the CdxHg1-x-y ZnyTe solid solutions. 相似文献
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N. O. Elyutin D. V. Lvov E. V. Rakshun A. N. Tyulyusov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(6):908-912
Pores in a graphite coating of fuel particles were studied by small-angle neutron scattering. Small-angle scattering curves
for individual coated fuel particles (CFPs) and a set of CFPs were measured. Their processing detected pores in CFP coatings.
Their characteristic sizes and the specific pore volume were determined. The applicability of this technique for studying
and nondestructive testing of atomic engineering materials was shown. 相似文献
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Crystallography Reports - The possibility of placing a universal neutron diffractometer, which is designed for working with perfect crystals, in one of the inclined channels of the PIK reactor is... 相似文献