Relationship of intensities of absorption bands of adsorbed molecules to the energy of adsorption and the number of adsorption sites

A derivation of an equation which makes it possible to relate the intensities of the absorption bands in the optical spectra of test molecules adsorbed on a surface to the number and energetics of the adsorption sites has been proposed. In the general case, the ratio between the intensities of absorption bands is determined by the energy of the interaction of the adsorbate with the surface sites, the ratio between the numbers of sites, and the oscillator strengths of the optical transitions of the adsorbed molecules. The validity of the equation has been confirmed by analyzing the transmission spectra of p-dimethylaminoazobenzene adsorbed on monosubstituted forms of Glukhov kaolinite containing singly (Na⁺, H⁺), doubly (Mg²⁺), and triply (A1³⁺) charged cations in its exchangeable positions.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 21, No. 4, pp. 475–480, July–August, 1985.     

Ground-based complex for checking the optical system

The purpose TUS space experiment is to study cosmic rays of ultrahigh energies produced by extensive air showers from space. The concentrator is located on satellite, made in the form of the Fresnel mirror towards the earth’s atmosphere, the focus of which is a photodetector. The angle of view of the mirror is ±4.5° that for a given height of the orbit corresponds to the area 80 × 80 km² on ground. The ground complex consisting of a number of stations, to check the optical system of the experiment is created, (their location and the amount will be determined after the launch of the satellite based on its actual orbit).     

Synthesis based on β-phenylethylamines X. Synthesis of new derivatives of phenylethylaminomethylbenzo-crown ethers

Three methods have been developed for the introduction of a β-phenylethylamine fragment into a benzo-crown ether molecule. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 796–800, November–December, 1998.     

Method of Eliminating Systematic Errors of Atomic Absorption Analysis in Atomization of a Material in a Graphite Furnace

By taking as an example the obtaining of the spectra of the gas phase over alkali metal iodides and calcium fluoride, we show the possibility of eliminating systematic errors of atomic absorption analysis which are due to nonselective absorption of light. It is been suggested that it makes sense to create a database that would contain molecular absorption spectra of the most abundant substances and would be intended for use by chemistsanalysts.     

The NUCLEON experiment: The current status

The main purpose of the NUCLEON experiment is direct measurements of the energy spectra of cosmic rays in the range 10¹¹–10¹⁵ eV with the use of the lightweight facility during a prolonged orbital flight. The energy is determined using a technique based on the measurement of the spatial density of secondary particles produced in the initial event of inelastic interaction. The schematic diagram of the NUCLEON facility, the current status of the project, the results of testing the prototype, and plans are presented.     

Aspect-ratio dependent oscillatory thermocapillary convection in the floating half zone

The dependency of the critical Marangoni number on the geometrical aspect ratio of the floating half zone is essential to predict the onset of oscillatory thermocapillary convection.The experimental studies in the microgravity conditions on floating half zones of several centimeters in diameter have predicted that the critical Marangoni number increases with the increasing aspect ratio,and the terrestrial experimental studies have predicted the contradictory conclusion for floating half zones of several mil...     

Elimination of geometric distortions in stereoscopic systems with converging optical axes

The problem on the possibility of eliminating the vertical disparity and depth plane curvature by representing the left and right perspective views in two intersecting planes of observation is successfully solved in the framework of the geometrical optics approximation. The expressions are found for the angle of intersection of the planes of observation providing the elimination of each of the studied distortions. It is shown that both studied distortions are eliminated for the same angle of intersection of the planes of observation.