http://dspace.nbuv.gov.ua:80/handle/123456789/114604 2026-04-13T07:15:47Z http://dspace.nbuv.gov.ua:80/handle/123456789/119136 The influence of ion implantation by phosphorous on structural changes in porous silicon Swiatek, Z.; Lytvynchuk, I.; Fodchuk, I. Structural changes in the surface layer of technologically treated silicon by ion implantation, chemical etching, and their combined action have been investigated by the X-ray diffractometry methods. The functional and quantitative differences in the thickness dependences of strains, values of maximum strain, level of lattice disturbance and extension of elastic strains nave been revealed after different steps of treatment. The essential modification of photoluminescence spectra was observed in the porous layer after implantation by phosphorus ions in the process of natural aging. 2004-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119135 Solid solutions of CdxHg₁₋xTe:V:Mn, CdxHg₁₋xTe:Ti:Mn (x = 0.9 – 0.95): growth and properties Paranchych, S.Yu.; Tanasyuk, Yu.V.; Romanyuk, V.R.; Romanyuk, O.S.; Makogonenko, V.M.; Andriychuk, M.D.; Synylo, S.V.; Ivonyak, Yu.I. Single crystals of CdxHg₁₋xTe:V:Mn, CdxHg₁₋xTe:V: Mn (x = 0.9–0.95) with different concentrations of vanadium, titanium and manganese have been obtained via the modified Bridgman method and their optical, photoelectrical and galvano-magnetic properties have been studied. According to the performed investigations, the grown crystals proved to be satisfactorily homogeneous and highly sensitive within technically important spectral range of 1–1.5 mm. Energy position of vanadium and titanium level in the material under investigation determined from R(T) dependence is of about 0.73–0.82 eV; 0.65–0.72 eV, respectively. 2004-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119134 The effect of structural-kinetic features of hologram formation on holographic properties of photopolymers Smirnova, T.; Sakhno, O.; Lozenko, S. A thermodynamic model of the holographic recording process in photopolymers have been developed. By the example of photopolymerizing compositions PPC-488 containing oligoetheracrylates and neutral components (NC) we have explored dependencies of holographic characteristics of medium on NC concentration and thermodynamic properties of polymer-NC system. The thermodynamic affinity of the polymer forming during recording and NC was evaluated using the difference of their solubility parameters ∆δP,NC. We have determined the feasible range of variation for ∆δP,NC and optimal concentration of NC ( 0 opt N ) that ensure high-performance recording. It was ascertained that excess in NC concentration over the optimal value leads to the increase of photoinduced light scattering in the layer. The efficiency of scattering depends on the size of microphase enriched by NC. We have determined the size of microphase particles and its dependence on kinetic parameters of polymerization. 2004-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119133 Gold and colloidal gold surface influence on dna conformational change Dovbeshko, G.I.; Gnatyuk, O.P.; Chegel, V.I.; Shirshov, Y.M.; Kosenkov, D.V.; Andreev, E.A.; Tajmir-Riahi, H.A.; Lytvyn, P.M. DNA conformational changes caused by gold and colloidal gold surface have been studied by surface enhanced infrared spectroscopy (SEIRA), spectroscopy of plasmon resonance (SPR), atomic force microscopy (AFM) and principal component analysis. Experimental data have shown that DNA conformation is slightly influenced by gold surface, while it is strongly altered by colloidal gold. Spectroscopic features of DNA-colloidal gold system have shown that the intensity of the asymmetric PO₂– band at 1240 cm⁻¹ decreases by two times, and that of symmetric band at 1090 cm⁻¹ decreases by 2.4 times whereas the halfwidth of phosphate bands increases by 35–40 cm⁻¹; a frequency shift of asymmetric band position from 1240 to 1246 cm⁻¹ and a symmetric band from 1090 to 1106 cm⁻¹ has been observed. It was shown that intensity variation and shift of DNA base vibrations together with the broadening of OH, NH, and CH stretching vibrations occur due to DNA conformational changes and the redistribution of the H-bonding network. A supposition about DNA condensation by colloidal gold was made. SEIRA and AFM data have showed major DNA structural changes occurred on gold colloidal particles. It was found that all the spectral features are more prominent for DNA–colloidal gold system deposited on gold substrate than on CaF₂ substrate. 2004-01-01T00:00:00Z