Characteristic features of carbazole phosphorescence quenching by benzophenone molecules in toluene at 77 K

We have studied the characteristic features of carbazole phosphorescence quenching by benzophenone in toluene at 77 K. We have shown that the decrease in the relative phosphorescence intensity for carbazole (energy donor) by a greater factor than we see for the relative change in its decay time is due to the fact that a change in the phosphorescence decay time occurs only for carbazole molecules participating in triplet-triplet energy transfer, while the substantial decrease in the phosphorescence intensity for carbazole with no change in the phosphorescence decay time is connected with quenching of its singlet states. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 4, pp. 554–556, July–August, 2006.     

Theoretical analysis of dissociative adsorption of H2O on Ni(100)

In conclusion, let us note the principal results of the calculation.

Trifunctional thermosetting monomer with propargyl and phthalonitrile groups

Russian Chemical Bulletin - A new monomer containing thermosetting groups of two types, namely, propargyl ether and phthalonitrile, in the structure of the molecule was synthesized and studied. It...     

Investigation of the conditions of efficient I*<Subscript>2</Subscript> (342 nm) luminescence in a barrier discharge in a Kr-I<Subscript>2</Subscript> mixture

The energy and spectral characteristics of a barrier discharge in a mixture of iodine vapor with krypton have been investigated theoretically and experimentally. The emission spectrum consists of the single I*₂ molecular band D′ → A′ peaking at 342 nm, the iodine resonance line at 206.2 nm, and the group of bands corresponding to iodine emission. The highest intensity of the I*₂ (342 nm) band was obtained at a mixture pressure near 450 Torr. A mean output power and an efficiency of 550 mW and 1.6%, respectively, have been achieved. It is shown that, for the I₂ barrier-discharge excilamp, the homogeneous, rather than filamentary form of discharge glow is optimal from the viewpoint of the highest mean output power. The maximal calculated value of the emission efficiency for the 342-nm band was 5%. The main processes determining energy losses in plasma have been found, and ways to increase the efficiency of emission in the D′ → A′ band of the I*₂ molecule have been proposed.     

On Enhancement of the Adsorption-Layer Effect at the Metallic Electrode−Liquid Electrolyte Interface in Specular Neutron Reflectometry Experiments

The possibilities for optimizing the substrate/electrode/electrolyte structure are considered in order to obtain the maximum change in the specular-reflection curves obtained in neutron reflectometry experiments at the electrochemical interfaces between a metallic electrode and liquid electrolyte containing Li⁺ ions during their operation. The characteristic relations between the scattering length densities of the components, for which the reflection curves most fully provide information about the structure of the solid electrolyte interphase layer formed on the electrode surface during the charge–discharge processes, are determined and analyzed.     

Possible levels of reducing radio wave reflection from an aerodynamic object covered by an absorbing plasma

We estimate the possible levels of reducing backward reflection of radio waves from an aerodynamic object covered by an absorbing plasma created on the object at tropospheric flight altitudes. This effect is analyzed in terms of a model one-dimensional problem of radio wave propagation in inhomogeneous layers of absorbing plasma. 5th Central Testing Institute of the Department of Defense of the Russian Federation, Voronezh, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 42, No. 9, pp. 893–899, September, 1999.     

Formation of fullerene clusters in carbon disulfide: Data on small-angle neutron scattering and molecular dynamics

Fullerene solutions in carbon disulfide are studied by small-angle neutron scattering (SANS). In addition to earlier experiments on the given system, the range of measured transmitted impulses is extended and the influence of solution preparation methods on C₆₀ cluster formation in these solutions is studied. It is shown that the formation of large C₆₀ clusters (with a size of about 10 nm) is due to nonequilibrium methods of solution preparation. For nonequilibrium dissolution, there is a 10% excess of the observed fullerene size in the solution over the calculated value. It has been established by simulation of the C₆₀/CS₂ interface by molecular dymanics methods that inclusion of how solvent molecules are organized on the C₆₀ surface leads to a decrease in the fullerene size in the solution, observed by using SANS. In this paper, the effect of excess R _g is explained by the presence of small clusters in the solution (approximately 10% of dissolved C₆₀ molecules). It is discovered that there is a time variation in the concentration of the saturated solution. The explanation of this effect using a model of formation and sedimentation of large clusters (with a size of 100 nm or more) is proposed.     

Test of Hybrid Metric-Palatini f(R)-Gravity in Binary Pulsars

Journal of Experimental and Theoretical Physics - We developed the parameterized post-Keplerian formalism for hybrid metric-Palatini f(R)-gravity. We obtained analytical expressions in the general...