Optoelectronic Properties and Molecular Ordering of Tetracene Thin Layers on Gold

Fourier transform infrared (FTIR) spectroscopy and scanning tunneling microscopy (STM) were used to study the molecular organization and morphology of vacuum-deposited tetracene layers. FTIR and optical measurements confirm that tetracene molecules are not dissociated during vacuum thermal deposition. With STM imaging, a highly ordered, closely packed, lamella-like structure of tetracene monolayer film on the Au(111) surface was observed. Electroluminescence from the nanocomposite consisting of Au nanoparticles and tetracene film is concentrated within submicron luminescent centers and occurs at voltages of 4–5 V in a superlinear section of conduction current–voltage curves. The results can be useful for the design of planar light-emitting devices.     

Effect of Laser and Temperature Treatment on the Optical Properties of Titanium Dioxide Nanoparticles Prepared Via Pulsed Laser Ablation

Russian Physics Journal - Nanomaterials based on titanium dioxide are of considerable interest as promising photocatalysts for water and air purification and hydrogen generation. To increase the...     

Laser Strengthening of a Steel Surface with Fullerene Coating

Doklady Physics - Modification of a steel surface by coating with fullerenes C60 and subsequent treatment by intense laser radiation has been investigated. The initial samples are made of...     

Electric field excited in air by a pulse of gamma rays

The characteristics of the electric field produced by air polarization during the passage of nonstationary Compton currents excited by a -ray pulse in low-density air are discussed. The influence of the field on the motion of the Compton electrons is taken into account. The amplitude and relaxation time of the field are evaluated. A polarization electric field is created through the action of a directed current of -rays in air because of the movement of the Compton electrons. This paper discusses the basic characteristics of the resultant field in low-density air. A similar problem was raised in [1], where the electromagnetic field excited by a nonstationary source of -radiation in the upper atmosphere was considered. In that case, the Compton-electron currents were specified and their magnitude was assumed to be proportional to the ratio between the gas kinetic ranges of Compton electron and -ray (this ratio is of the order of 0.01 and is indepenent of height). With an increase in electron range, however, the decelerating action of the resultant electric field on the motion of the Compton electron becomes important (eE/ is a criterion for the effect; E is the field intensity, and and are the range and energy of the Compton electron).Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 4, pp. 3–8, July–August, 1970.In conclusion, the authors thank G. M. Gandel'man for several discussion.     

Diamagnetism of conductors moving in a magnetic field

Several theoretical [1–3] and experimental [4] studies have been made of the diamagnetic perturbations during expansion of a conducting material in a magnetic field. These studies have related either to superconducting media [1], or to a strong magnetic field which has a considerable effect on the motion of the medium [2], or to a weakly ionized media, in which the effects of field variation in the medium can be neglected [3]. In the following we examine the expansion of a substance with finite conductivity in a weak (having no effect on the motion of the medium) magnetic field with account for the effects of field attenuation within the expanding matter. This occurs in the diagnostics of the state of the matter of a spark at a laser focus on the basis of diamagnetic induction signals [4]. The relations obtained in the following appear to be applicable for estimating the diamagnetic properties of meteor trails.The method of solution of this problem may be of some interest; therefore, in the following the solution is obtained by several techniques for different basic geometries.     

Dynamics of thin films in a magnetic field

The oscillations of thin conducting films placed in a magnetic field are considered. The effect of the field in different directions on the effective elasticity of the film is described and dispersion relations are obtained for longitudinal and transverse waves.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 3, pp. 174–180, May–June, 1976.     

6,6′-Dimethyl-1,1′,5,5′-tetraaza-6,6′-bi(bicyclo[3.1.0]hexane): synthesis and investigation of molecular structure by quantum-chemical calculations,NMR spectroscopy and X-ray diffraction analysis

Structural Chemistry - A new diaziridine derivative with two bicyclic diaziridine-containing moieties in one molecule,...     

Thioamides from 5-arylfurfural and monosubstituted piperazine derivatives (Wilgerodt-Kindler reaction)

Interaction of 5-arylfurfurals or arylaldehydes with secondary amines (monosubstituted piperazines, morpholine, piperidine) and sulfur under conditions of Wilgerodt-Kindler reaction provided N-substituted thioamides of 5-arylfuran-2-carboxylic and benzoic acids.     

Experimental and computer study of the spatial distributions of particles sputtered from polycrystals

The spatial distributions of the sputtered particles were simultaneously and separately studied by experiment and computer simulation for 30 keV argon ion bombardment of copper in a wide range of primary-ion incidence angles (0°–86°). The distributions were found to be similar. The discrepancies between the data obtained and the predictions of the Roosendaal-Sanders analytical theory are discussed.