The influence of ultrashort excitations on the vibrational dynamics in a diatomic molecule

The problem of vibrational wave packet dynamics in the system of two electronic states of a diatomic molecule, where the states are coupled by infinitely short light pulses, is solved. The electronic states were modeled by shifted harmonic oscillators with different frequencies. Exact expressions for the probability densities of the wave packets in the ground and excited states were derived. The spatial, spectral, and temporal characteristics of the wave packets, namely, the range of motion, spatial width, mean energy, spectral width (the mean number of vibrational states in a wave packet), and the autocorrelation function, were calculated as functions of the molecular parameters (the frequency ratio and the distance between the potential minima) and of the delay time between the light pulses. The possibility of controlling the mean energy and spectral width of the wave packets in the ground electronic state by varying the delay time is considered. It was shown that "squeezed" wave packets can be prepared in the ground electronic state if the upper electronic state is shallow.     

Associates of thioalkyl derivatives of 2-arylaminopyrimidine with hydroxyapatite-based nanocomposites

Co-precipitation and ultrasonic treatment methods have been used for the in situ formation of the composites of hydroxyapatite (HA) covered with nanoparticles of magnetite as well as compositions of magnetite, gold and silver. The thioalkyl-substituted derivatives of 2-arylaminopyrimidine, structural analogs of antitumor drug Imatinib containing one or two SH groups and capable to chemisorption on hydroxyapatite and its nanocomposites, have been synthesized. Two-component Fe₃O₄(HA) and three-component Fe₃O₄(HA)Au and Fe₃O₄(HA)Ag composites have been found the most promising as nanocarriers of bioactive compounds.     

DSC study of the behavior of water during hydration processes in ionites

Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 35, No. 6, pp. 190–193, November–December, 1994.     

Formation of iron-containing composites

The influence of corrosion inhibitors of different types on the formation of iron-containing composites in the presence of polyvinylpyrrolidone (PVP) and polyethyleneimine (PEI) was studied. It was shown that the composite containing sodium citrate is the most resistant to oxidation. To form the PVP?Fe?PEI composite in the medium containing a tea extract, no NaBH₄ is necessary to be added, whereas in the presence of P. adametzii fungal culture fluid permeate the reaction medium should contain an excess of NaBH4. For aldehyde functionalization of the PVP?Fe?PEI composite was activated with glutaraldehyde or dextran Т20 oxidized with NaIO₄.