"Technical Physics Letters"

Yasnikov, I. S.;Vikarchuk, A. A.

doi: 10.1134/S1063785006100014pmid: N/A

Abstract The results of experiments which reveal the dependence of the habit of electrodeposited pentagonal microcrystals on the intensity of heat exchange related to the evolution of crystallization heat are presented and considered in terms of the previously developed theoretical model of the thermal evolution of a growing microcrystal as dependent on its size in the initial growth stage.

Myagkov, V. G.;Bykova, L. E.;Bondarenko, G. N.

doi: 10.1134/S1063785006100026pmid: N/A

Abstract The results of experiments on the synthesis of epitaxial B2-NiAl layers by means of nanosecond laser irradiation of sequentially deposited thin nickel and aluminum layers (Al/Ni bilayers) on a MgO(001) substrate surface are presented. Features of the phase formation under the laser action and during the combustion wave initiation are considered. The rapid formation of an epitaxial B2-NiAl layer is explained in terms of a martensitic-like mechanism of the transfer of reacting atoms via a layer of reaction products. It is suggested that this mechanism can compete with diffusion via grain boundaries and dislocation, thus explaining the ultrafast transfer of reacting atoms via a layer of reaction products for various methods of initiation of the solid-state synthesis.

Komolov, S. A.;Lazneva, É. F.

doi: 10.1134/S1063785006100038pmid: N/A

Abstract The process of interface formation between two organic films composed of donor (copper phthalocyanine, CuPc) and acceptor (perylene-3,4,9,10-tetracarboxylic dianhydride, PTCDA) molecules has been studied in situ using the total current spectroscopy technique. It is established that the donor-acceptor interaction between CuPc and PTCDA molecules do not distort the energy structure of the density of electron states. The main π*, σ*1, and σ*2 bands of antibonding (unoccupied) electron states are identified, which are determined both by C-C bonds in the aromatic rings and by additional C-N and C-O bonds. The width of the interface potential barrier is evaluated and its relation to the limiting polarizability of molecules is demonstrated. The interface potential barrier is formed in the course of negative charge transfer between donor (CuPc) and acceptor (PTCDA) molecules.

Ganzherli, N. M.;Maurer, I. A.;Chernykh, D. F.

doi: 10.1134/S106378500610004Xpmid: N/A

Abstract The results of experiments with holographic imaging by means of reference-free selectograms recorded in thick layers of self-developing glycerol-containing dichromated gelatin (DCG) are presented. The contrast of the reconstructed image is characterized as a function of the spatial frequency.

Gorodtsov, V. A.;Gotlib, V. A.;Lisovenko, D. S.;Salganik, R. L.

doi: 10.1134/S1063785006100051pmid: N/A

Abstract The strength of filamentary crystals (whiskers) of graphitelike materials, which are characterized by a layered structure and significantly anisotropic mechanical behavior, is briefly analyzed. Model thin rods (with micro-or nanoscale dimensions) of such materials exhibit certain specific features in the statistical tensile strength behavior, which are related to competition between the normal separation and mutual sliding of the adjacent graphene layers.

Sorokin, S. A.

doi: 10.1134/S1063785006100063pmid: N/A

Abstract The energy spectra of fast ions produced in the course of electrodynamic acceleration of deuterium plasma in an inverse Z-pinch geometry have been measured. It is established that the radial acceleration and subsequent free expansion of plasma lead to the formation of a flux of ions with a rather broad energy spectrum. In addition to the main group of ions with energies within 2–10 keV, the flux contains fast ions with energies of up to 200 keV and above.

Bochkov, A. V.;Zagidulin, A. V.;Magda, É. P.;Mironenko, V. V.;Sofienko, G. S.;Podymako, A. S.

doi: 10.1134/S1063785006100075pmid: N/A

Abstract The possibility of lasing in a YAP:Tm3+ crystal with 3F4 level of the Tm3+ ion directly pumped by narrowband radiation of a gas laser operating in the middle IR range has been studied. The efficiency of the pumped energy conversion into spontaneous emission on the 3F4-3H6 transition in the Tm3+ ion was within 65–75%. The efficiency of generation with respect to the absorbed pumping energy was ∼4%.

Kikin, P. Yu.;Perevezentsev, V. N.;Pchelintsev, A. I.;Rusin, E. E.

doi: 10.1134/S1063785006100087pmid: N/A

Abstract The formation of holes under the action of single laser pulses was studied in thin-sheet samples of aluminum alloy 1420 with ultrafine-grained (UFG) and coarse-grained (CG) structures. It is established that, at the same laser pulse energy, a hole in the UFG samples is formed in a shorter period of time than in the CG samples of the same thickness.

Baksht, E. Kh.;Lomaev, M. I.;Rybka, D. V.;Tarasenko, V. F.

doi: 10.1134/S1063785006100099pmid: N/A

Abstract The emission characteristics of plasma of a volume discharge initiated by electron avalanche beams in heavy inert gases at pressures up to 1.5 bar have been studied. It is established that more than 90% of the energy radiated in the wavelength range from 120 to 850 nm is emitted from xenon, krypton, and argon dimers. In the case of excited xenon plasma, an output radiation power of ∼300 kW and an energy of 45 mJ per cubic centimeter were obtained.

Baikov, Yu. M.

doi: 10.1134/S1063785006100105pmid: N/A

Abstract A hydrogen isotope effect in electrode potentials has been observed for the first time at 368 ± 0.5 K in solid hydroxide protonic PdHx|KOH · nH2O (x < 0.02, n = 0.5 and 1) heterojunctions obtained upon electrochemical activation of Pd|KOH · nH2O|M heterostructures, where M = Pd or C (graphite). The chemical composition of the second (M) electrode did not influence the isotope shift of the electrode potential upon the complete replacement of protium by deuterium, which amounted to 105 ± 15 and 120 ± 20 mV for n = 0.5 and 1, respectively. The isotope shift in the electrode potential of the “hydrogen solution in palladium-hydroxide proton conductor” heterojunction implies the presence of quantum effects. The observed isotope shift is correlated with the isotope effects in the zero-point energies of (i) protons involved in the O-H chemical bonds in the structural units of electrolyte and (ii) hydrogen atoms dissolved in palladium.