Papers by Tamerlan Magkoev
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques, Nov 30, 2023
Catalysts, May 10, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Письма в журнал технической физики, 2022
To establish the mechanism of high emission efficiency of lanthanum hexaboride as one of the most... more To establish the mechanism of high emission efficiency of lanthanum hexaboride as one of the most widely used electron emitters, a comparative study of the state of La and B atoms in the La–B double film, on one hand, and in the separate La and B films – on the other, was done via probing the state of such films via carbon monoxide adsorption. It is shown that the formation of the La–B dipole layer on the surface is the main reason for the high emission effectiveness of lanthanum hexaboride. As such, the subnanometer La–B film systems may be promising as electron emitter of a high degree of spatial locality.
Topics in Catalysis, Jan 31, 2023
Surface Science, 2007
ABSTRACT Interaction of carbon monoxide and oxygen on the surface of titania/Au(1 1 1) inverse mo... more ABSTRACT Interaction of carbon monoxide and oxygen on the surface of titania/Au(1 1 1) inverse model catalyst held at 200 K has been studied by reflection absorption infrared spectroscopy. It was found that CO adsorbs on the oxide/Au perimeter interface, whereas no or very weak adsorption was observed on Au(1 1 1) or titania surface, respectively. Exposing of such species to oxygen results in their decay possibly due to carbon dioxide formation. Efficiency of this effect is higher at lower CO initial concentration which points at the importance of free surface sites for the reaction process.
Russian Physics Journal, 1998
ABSTRACT We analyze the rotational energy distribution N(J) for NO molecules desorbed from a Pt (... more ABSTRACT We analyze the rotational energy distribution N(J) for NO molecules desorbed from a Pt (111) surface, taking into account the valence electron excitations, using a simple impulse model. We find a linear dependence between ln N(J) and (Er)1/2, where Er is the rotational energy of the desorbed molecules. The excited state lifetime and the critical residence time in the excited state, evaluated from the given dependences, are close to each other, and in order of magnitude are 10−15 s. We also estimate the frequency and amplitude of the tilting vibrations of the adsorbed molecules in the excited state.
Russian Physics Journal, 2021
Russian Physics Journal, 2005
The joint adsorption of CO and NO molecules on the surface of nanodimensional nickel clusters for... more The joint adsorption of CO and NO molecules on the surface of nanodimensional nickel clusters formed on the Мо(110) face of a thin MgO(111) magnesium oxide film under conditions of ultrahigh vacuum is investigated by methods of infrared reflection and thermal desorption spectroscopy. It is revealed that the adsorption of the NO molecules changes significantly the state of the adsorbed CO molecules. Based on an analysis of thermal desorption and IR spectra, a conclusion can be drawn that the adsorption of the NO molecules stimulates the migration of the CO molecules from the metal cluster surface to the boundary between the cluster and oxide accompanied by a decrease in the tilt angle of the molecular axis to the surface.
Surface Science Letters, 1993
ABSTRACT A way for the determination of the values of intramolecular charges of adsorbed molecule... more ABSTRACT A way for the determination of the values of intramolecular charges of adsorbed molecules of some binary dielectrics, based on Auger electron spectroscopy (AES), is proposed. These values can be obtained from the coverage dependences of the ratios of intensities of anion KL23L23 and KL1L1 Auger transitions, which are sensitive to the amount of charge at the 2p-orbitals. As an example, MgO adsorbed on Mo(110) is presented.
Solid State Communications, 2004
ABSTRACT Coadsorption of NO and CO molecules on the Ni clusters deposited on MgO(111) film formed... more ABSTRACT Coadsorption of NO and CO molecules on the Ni clusters deposited on MgO(111) film formed on a Mo(110) crystal has been studied by reflection–absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD). It is found that adsorption of NO molecules strongly affects the state of CO molecules, which were initially adsorbed on the Ni clusters. The observed features in RAIRS and TPD spectra are attributed to the change of the CO adsorption site and geometry, which is induced by NO adsorption.
Nanomaterials
In-situ formation of boron thin films on the Mo(110) surface, as well as the formation of the mol... more In-situ formation of boron thin films on the Mo(110) surface, as well as the formation of the molybdenum boride and its oxide and the trends of carbon monoxide catalytic oxidation on the substrates formed, have been studied in an ultra-high vacuum (UHV) by a set of surface-sensitive characterization techniques: Auger and X-ray photoelectron spectroscopy (AES, XPS), low-energy ion scattering (LEIS), reflection-absorption infrared spectroscopy (RAIRS), temperature-programmed desorption (TPD), electron energy loss spectroscopy (EELS) and work function measurements using the Anderson method. The boron deposited at Mo(110) via electron-beam deposition at a substrate temperature of 300 K grows as a 2D layer, at least in submonolayer coverage. Such a film is bound to the Mo(110) via polarized chemisorption bonds, dramatically changing the charge density at the substrate surface manifested by the Mo(110) surface plasmon damping. Upon annealing of the B-Mo(110) system, the boron diffuses int...
Technical Physics Letters
Nanoscience and Nanoengineering, 2013
Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-ecology of the North Caucasus” (CIGGG 2018), 2019
The article considers the complex analysis of geological data on the basis of the use of the high... more The article considers the complex analysis of geological data on the basis of the use of the high-velocity model of the microseismic sounding method (MMS) on the sections of the Central Caucasus. At the same time, based on the analysis of the results obtained, the high potential possibilities of the MMS method are shown in conditions of deep development of tectonic processes. Geological and geophysical data confirming the correspondence of anomalous objects to the velocity model of MMS with known structures and tectonic dislocations located at considerable depths are given. It is concluded that the use of MMS has a good prospect. It can become a direction of innovative development not only in the study of deep and oil-andgas bearing structures, but also in the search for ore deposits through the solution of structural-tectonic, lithologic and morphological signs of ore occurrence control and a systematic understanding of the factors responsible for the formation of metallogenic spec...
Carbon monoxide oxidation on the surface of in-situ prepared direct and inverse model Au/TiO2 cat... more Carbon monoxide oxidation on the surface of in-situ prepared direct and inverse model Au/TiO2 catalyst have been studied in ultra-high vacuum condition by a set of surface science analytical techniques. It is found that a metal/oxide perimeter interface is an active area for CO to CO2 transformation. Measurements with isotopically labeled O2 reveal that carbon dioxide is formed over Au/titania via the participation of oxygen specie of titanium oxide. Efficiency of the process is higher for the system consisting of reduced titania (TiOx, x<2) compared to TiO2. Results offer a number of possibilities to improve the performance of real Au/TiO2 catalyst.
Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-ecology of the North Caucasus” (CIGGG 2018), 2019
Conditionally the process of stress-strain development of the medium begins with dislocation in c... more Conditionally the process of stress-strain development of the medium begins with dislocation in crystals; then it runs with the formation of a zone of rock fracture and ends with the collapse of the massif (fracture under natural conditions). Each stage of the stress-strain development or the change is characterized by the specific value of the amplitudefrequency vibrations of the medium caused by this change. Massif response to the action of the deforming stress is manifested by a breakdown of the electrical connections in the crystal lattice. An assessment of modern means of personnel safety control and prevention of the state of the elements of local underground space (based on electrical and radio circuit diagrams that are not protected from electromagnetic interference) has been made. Significant disadvantages include their exposure to the human factor in the form of forced shutdown. Changes in the dipole moments in a covalent bond lead to the appearance of electromagnetic pulses, and the residual deformations in the form of dislocations create acoustic wave fields. The energy characteristic of three components of intermolecular interactions (orientation, inductive and dispersed) is given in the paper.
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Papers by Tamerlan Magkoev