Effect of Atomic Hydrogen Concentration in the Study of Adsorption on Graphene

2011 ◽  
Vol 465 ◽  
pp. 211-214
Author(s):  
A.V. Pak ◽  
Nikolay G. Lebedev
Keyword(s):  
Band Structure ◽  
Russian Federation ◽  
Atomic Hydrogen ◽  
Function Method ◽  
Hydrogen Adsorption ◽  
Adsorbed Hydrogen ◽  
Hydrogen Atoms ◽  
Statistical Research ◽  
Graphene Surface ◽  
Quantum Statistical

The results of theoretical quantum-statistical research of atomic hydrogen adsorption on the graphene surface within the framework of the periodic Anderson’s model have been presented. The band structure of graphene with adsorbed hydrogen atoms is calculated by the Green's function method. The work is supported by The Education Ministry of Russian Federation (project No. NK-16(3)).

Hydrogen Adsorption of Ruthenium: Isosteres of Solubility of Adsorbed Hydrogen

1998 ◽  
Vol 513 ◽  
Author(s):  
S. Yu. Zaginaichenko ◽  
Z. A. Matysina ◽  
D. V. Schur ◽  
V. K. Pishuk
Keyword(s):  
Phase Transition ◽  
Free Energy ◽  
Theoretical Investigation ◽  
State Transition ◽  
Hydrogen Adsorption ◽  
Adsorbed Hydrogen ◽  
Hydrogen Atoms ◽  
Hexagonal Close Packed ◽  
The Face ◽  
Pressure Hydrogen

ABSTRACTThe theoretical investigation of solubility isosteres of adsorbed hydrogen has been performed for free face (0001) of crystals with hexagonal close-packed lattice A3 of Mg type. The face free energy has been calculated and its dependence on temperature, pressure, hydrogen concentration and character of hydrogen atoms distribution over surface interstitial sites of different type has been defined. The equations of thermodynamic equilibrium and solubility of adsorbed hydrogen have been defined. The plots of isosteres in the region of phase transition from isotropic to anisotropic state have been constructed and it has been established that in anisotropic state the order in distribution of hydrogen atoms over interstitial sites of different type must become apparent. Comparison of the theoretical isosteres with experimental for ruthenium has been carried out, the isotropic-anisotropic state transition can stipulate a stepwise and break-like change in isosteres.

Surface Luminescence of Polycrystalline Zinc Oxide Excited by Hydrogen Atoms

2006 ◽  
Vol 957 ◽  
Author(s):  
Michael Sushchikh ◽  
Vladislav Styrov ◽  
Vladimir Tyutunnikov ◽  
Nick Cordella
Keyword(s):  
Atomic Hydrogen ◽  
Hydrogen Atmosphere ◽  
Adsorbed Hydrogen ◽  
Hydrogen Atoms ◽  
Long Wavelength ◽  
Pl Spectra ◽  
Zno Powders ◽  
Exothermic Chemical Reaction ◽  
Heterogeneous Chemiluminescence ◽  
Surface Luminescence

ABSTRACTExcitation of a luminescence by highly exothermic chemical reaction on the surface of a luminophore provides a unique opportunity to separate surface luminescence from the bulk luminescence. This enables studies of the electronic properties of the semiconductor surfaces even if the surfaces are of complicate shapes. We have studied heterogeneous chemiluminescence (HCL) of ZnO powders. The luminescence was excited by a release of chemical energy, namely by catalytic recombination of hydrogen atoms. The HCL spectra were compared to the photoluminescence (PL) spectra. The HCL spectra were sensitive to the details of preparation and treatment whereas PL spectra almost did not change. HCL spectra of powder samples pretreated for enhancing “green” luminescence exhibited long-wavelength tail (up to 800 nm) and their maximum was blue-shifted as compared with PL spectra. Different HCL bands forming long-wavelength tail were isolated by changing the temperature of the samples. Additional milling of ZnO led to amplification of the HCL-specific surface bands. Pure ZnO showed neither PL nor HCL; however we were able to observe HCL surface bands with maxima at 610 nm and 730 nm after treatment of the sample in atomic hydrogen atmosphere at 570 K. Remarkably, such treatment did not cause appearance of the PL. The HCL in the presence of atomic hydrogen was steady in time and was caused by an abstraction of adsorbed hydrogen by incident hydrogen atoms, i.e. the reaction followed Eley-Rideal mechanism. The HCL can be utilized for in situ monitoring of the growth and evolution of ZnO in controlled atmosphere.

The State of Hydrogen Desorbing from Intermediates Formed by Ammonia Interaction with Tungsten Surfaces

1974 ◽  
Vol 52 (7) ◽  
pp. 1147-1154 ◽  
Author(s):  
Y. K. Peng ◽  
P. T. Dawson
Keyword(s):  
Hydrogen Atom ◽  
Atomic Hydrogen ◽  
Surface Concentration ◽  
Hydrogen Desorption ◽  
Pure Hydrogen ◽  
Adsorbed Hydrogen ◽  
Tungsten Filament ◽  
Hydrogen Atoms ◽  
Ionization Source ◽  
Hydrogen Desorbing

Ammonia interaction with a tungsten surface can generate dense adlayers containing nitrogen and hydrogen, i.e. an η-species of surface stoichiometry Ws2N3H. In thermal desorption mass spectrometry experiments, hydrogen desorbing from the η-species interacts with the glass wall in a manner similar to that previously observed for atomic hydrogen. This paper describes two mass spectrometric techniques designed to confirm this conclusion directly. The first method uses a line-of-sight geometry between the tungsten filament and the ionization source of the mass spectrometer and the results indicate that, at least, part of the hydrogen desorbing from the η-species does so atomically. In the second method a multiple wall collision geometry is used but prior saturation of the wall with D atoms will result in an HD+ ion current for desorbing H atoms. The results suggest that 26% of the hydrogen desorbs atomically. Hydrogen atom desorption from the η-species occurs at tungsten filament temperatures below those required for hydrogen atom evaporation from a pure hydrogen adlayer. It is proposed that a reduced binding energy for adsorbed hydrogen atoms and a reduced mobility of these adatoms arises from the presence of a large surface concentration of nitrogen. This will result in the rates of atomic hydrogen desorption and bimolecular recombination becoming comparable at temperatures lower than is the case for pure hydrogen interaction with tungsten. The implications of these results for the ammonia synthesis reaction are discussed.

A Theoretical Study of a H–H Pair on the BCC Fe(100) Surface

2003 ◽  
Vol 10 (04) ◽  
pp. 661-668 ◽  
Author(s):  
E. Gonzalez ◽  
G. Brizuela ◽  
C. Pistonesi ◽  
A. Juan
Keyword(s):  
Electronic Structure ◽  
Nearest Neighbor ◽  
Theoretical Study ◽  
Hydrogen Adsorption ◽  
Theoretical Method ◽  
Adsorbed Hydrogen ◽  
Local Energy ◽  
Hydrogen Atoms ◽  
Adsorption Sites ◽  
Metallic Bond

Hydrogen adsorption on Fe(100) was analyzed using a semiempirical theoretical method. Calculations were performed using a Fe 130 cluster. Adsorption sites for one and two hydrogen atoms on the surface correspond to local energy minima configurations. Changes in the electronic structure of surface Fe atoms were analyzed for the system without hydrogen and with one and two adsorbed hydrogen atoms. Fe atoms close to H weaken their metallic bond. This is due to the formation of H–Fe bonds. Hydrogen influences only its nearest neighbor Fe atoms. The H–H interaction was also analyzed and our results show that H–Fe interaction is much stronger than any possible H–H interaction. No additional decohesion is observed in the Fe–Fe bonds; however, more Fe–Fe bonds are affected.

An analysis of the practice of marketing management of the socio-economic development of the Russian Federation subjects

2020 ◽  
Vol 18 (3) ◽  
pp. 429-445
Author(s):  
I.A. Artashinа ◽  
V.Yu. Dudina ◽  
Yu.N. Zhul'kova
Keyword(s):  
Strategic Planning ◽  
Russian Federation ◽  
Regional Economy ◽  
Well Being ◽  
Effective Management ◽  
Statistical Research ◽  
Investment Activity ◽  
General Scientific ◽  
The Russian Federation ◽  
Visualization Techniques

Subject. This article considers the system of strategic planning documents as a scientific and practical basis for achieving the goal of improving the well-being of the population by increasing investment activity and the competitiveness of the regional economy. Objectives. The article aims to explore the possibilities and features of the application of marketing technologies in the effective management of the development of the Russian Federation constituent entities. Methods. For the study, we used the methods of general scientific and statistical research, content analysis, and data visualization techniques. Results. The article presents a brief analytical overview of strategic planning documents and analysis of the possibilities of using modern marketing tools. The article also highlights the use of marketing to improve the competitiveness of a particular area, taking into account the experience of leader regions. Conclusions. Modern strategic documents regulating the development of regions have some contradictions in terms of the characteristics of the state of the Russian Federation subjects concerning various indicators of development. The problems and practicalities of addressing them need to be more clearly identified. The results of the study can be used by regional and municipal authorities to develop plans to improve the strategic management of the areas' development.

Water and Atomic Hydrogen Adsorption on Magnetite (001)

2019 ◽  
Vol 123 (43) ◽  
pp. 26662-26672 ◽  
Author(s):  
Björn Arndt ◽  
Marcus Creutzburg ◽  
Elin Grånäs ◽  
Sergey Volkov ◽  
Konstantin Krausert ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Hydrogen Adsorption

Model of atomic hydrogen adsorption on thin gold film surface

Vacuum ◽  
1994 ◽  
Vol 45 (2-3) ◽  
pp. 299-301 ◽  
Author(s):  
L. Stobiński ◽  
R. Duś
Keyword(s):  
Atomic Hydrogen ◽  
Hydrogen Adsorption ◽  
Gold Film ◽  
Film Surface ◽  
Thin Gold Film

scholarly journals Сечения образования ионов He-=SUP=-+-=/SUP=- в различных электронных состояниях при столкновениях ионов He-=SUP=-2+-=/SUP=- с атомами водорода

2020 ◽  
Vol 90 (6) ◽  
pp. 895
Author(s):  
А.А. Басалаев ◽  
В.В. Кузьмичев ◽  
М.Н. Панов ◽  
О.В. Смирнов
Keyword(s):  
Kinetic Energy ◽  
Electron Capture ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Precision Measurements ◽  
Capture Cross ◽  
Hydrogen Atoms ◽  
Hydrogen Target ◽  
Degree Of Dissociation ◽  
Capture Cross Sections

Using collision spectroscopy based on precision measurements of the kinetic energy of projectile ions that capture an electron, we measured the state selective electron capture cross sections of formation of He^+(n) ions at collision 3^He^{2 +} ions with an energy of E = 1.4-10 keV/a.m.u. with hydrogen atoms. The atomic hydrogen target with a degree of dissociation 78% at a temperature of tungsten dissociation cell 2180K has been made.

scholarly journals Regional comparisons of the accessibility and use of ICT in the regions of Russia: the possibility of using integrated indicators

2020 ◽  
Vol 17 (1) ◽  
pp. 25-34
Author(s):  
S. G. Bychkova ◽  
L. S. Parshintseva
Keyword(s):  
Information And Communication Technologies ◽  
Russian Federation ◽  
Information Society ◽  
Direct Relationship ◽  
Federal District ◽  
Communication Technologies ◽  
Statistical Research ◽  
Federal Districts ◽  
Information And Communication ◽  
The Russian Federation

The aim of the study. The aim of the study is a statistical analysis of the accessibility and the use of information and communication technologies for the population and households based on the developed integrated indices in the regional aspect.Fundamental international documents refer to the increasing role of information in all spheres of society, and indicate that the number of the poorest households with, for example, a mobile phone is higher than that with the access to clean drinking water.Thus, it can be noted that the level of accessibility and use of information and communication technologies is a priority for the development of both individual countries and the world community as a whole.Materials and methods. Methods of grouping and multidimensional classification, analysis of variation, normalizing, construction of multidimensional averages and correlation analysis, as well as tabular and graphical methods of visual representation of the results of the study were used as statistical tools for the study. Microsoft Excel was used to process the primary information.Results. Comparison of currently used indicators has revealed the need to develop and build integrated indices in four main areas of ICT research: infrastructure (physical and information), ICT accessibility (physical and price affordability), the use of ICT (by the population and households, enterprises and organizations, in the public sector), knowledge and skills (education, digital skills). In this study, the analysis was carried out according to the characteristics of the accessibility and the use of ICT for the population and households. The results of the study at the federal district level led to the conclusion that, despite the existence of a unified policy in the field of ICT development and information society at the federal level, there are significant differences in the management of this process and the level of implementation of system development measures for ICT in individual federal districts and regions. The main result of the study is the classification of regions by levels of accessibility and use of ICT. The analysis revealed a significant direct relationship between the components of ICT accessibility and its use. The ratings based on the calculated multidimensional averages allowed us to reveal the leader and lagging regions of the Russian Federation in terms of the development of ICT and information society.Conclusion. According to the results of the statistical research positions of regions of the Russian Federation on the accessibility levels and the use of information and communication technologies were determined, as well as a direct relationship between the indices of accessibility and the use of ICT was revealed as a whole in the Russian Federation, and in individual federal districts.

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