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Letteratura scientifica selezionata sul tema "Electron configuration"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 9 giugno 2025

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Articoli di riviste sul tema "Electron configuration"

Pressler, David E. "Atomic Electron Configuration." International Journal of Modern Physics A 16, supp01c (September 2001): 922–24. http://dx.doi.org/10.1142/s0217751x01008503.

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In this work I suggest that early twentieth century theoretical physicists did not have enough facts or experimental data to formulate a consistent atomic model and as a result the concept of the atom needs revised. I conclude that the new atomic model presented is based only on first principles, is easy to understand and visualize, and provides such a significant theoretical advance as to be a final theory.

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Yang, Qing, and J. D. Fan. "Topologic configuration of electron." Modern Physics Letters A 33, no. 26 (August 24, 2018): 1850163. http://dx.doi.org/10.1142/s0217732318501638.

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Motion of an electron is much different from that of a kind of matter in classical mechanics. Although it is impossible to directly observe the configuration of a bare electron, it is never as simple as to treat it as a three-dimensional (3D) particle in the microscopic world because the electron itself certainly has its own topological configuration, so that it presents a field of a unit charge and a spin, etc. An electron produces a magnetic field in motion and also can radiate or absorb an electromagnetic field in its accelerating motions. Thus, the topological configuration of an electron must be related or similar to the configurations of the magnetic field and electromagnetic wave. Starting from the topological configuration of a single electromagnetic wave, it is possible to derive that an electron is a quantized left-hand Möbius strip, on the center of which there exists an anti-neutrino. The Möbius strip excites a [Formula: see text] circumference of a unit negative charge and a linear electric field of a [Formula: see text] torsion and can explain the wave feature of the electron and the essential cause of producing a magnetic field and radiating an electromagnetic wave as well as predict that the second-order tensor field among the three quarks in a proton has a topological configuration of right-hand three-leaf knot and can excite a [Formula: see text] circumference of a unit positive charge and a linear electric field of a [Formula: see text] torsion, which is just allelomorphic to an electron.

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Mercero, José M., Joseph E. Fowler, Cecilia Sarasola, and Jesus M. Ugalde. "Atomic configuration-interaction electron-electron counterbalance densities." Physical Review A 59, no. 6 (June 1, 1999): 4255–58. http://dx.doi.org/10.1103/physreva.59.4255.

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Mulyawati, Tin, and Eka Purwanda. "Implementasi Alat Peraga “Ikon-E” Merupakan Kunci Sukses Memahami Konfigurasi Elektron (Cara Pengisian Konfigurasi Elektron Sebagai Media Pembelajaran Inovatif di SMA)." NUSRA : Jurnal Penelitian dan Ilmu Pendidikan 5, no. 2 (May 28, 2024): 700–706. http://dx.doi.org/10.55681/nusra.v5i2.2631.

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This research aims to evaluate the effectiveness of using electron configuration content tools ("e-icons") as a learning medium at the Senior High School (SMA) level. Electron configuration is an important concept in chemistry and understanding it can improve students' understanding of class X atomic structure material. Research data will be collected through a knowledge test on the group of students who use the "e-ikon" tool, called the experimental group, and the group of students without using the "e-ikon" tool, called the control group. Also, through a questionnaire that assesses students' perceptions of the use of electron configuration content tools. Data analysis will be conducted to determine whether the use of the electron configuration content tool can improve students' understanding and help them better internalize the concept of electron configuration. The conclusion that can be drawn is that the scores of students from the experimental class group have a higher average score than the average scores of students from the control class group. This means that the "e-icon" tool has a real influence on students in understanding electron configurations. The time needed for teachers to explain is shorter with the help of the “e-icon” tool. Students become happier studying chemistry. Filling in the configuration using tools lasts a long time in the student's memory.

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Ulianov MSc, PhD, Policarpo Yoshin. "Comparison of pauling and Ulianov electron distribution models." Material Science & Engineering International Journal 8, no. 2 (May 27, 2024): 49–54. http://dx.doi.org/10.15406/mseij.2024.08.00235.

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This study presents a comprehensive comparison between the traditional Pauling electron distribution model and the innovative Ulianov model proposed by Dr. Policarpo Yoshin Ulianov. The Pauling model, which relies on the Aufbau principle, Hund’s rule, and the Pauli Exclusion Principle, has been a cornerstone in understanding electron configurations within atoms, organizing electrons into s, p, d, and f orbitals. In contrast, the Ulianov model introduces a novel linear progression for electron occupancy, proposing additional orbitals (g and h) to account for electron distribution in a manner that deviates from conventional methodologies. Through an analytical comparison, this paper evaluates both models in terms of functionality, energy levels, and methodology, highlighting the advantages and disadvantages inherent to each. The Pauling model is recognized for its empirical support and wide acceptance, offering a well-established framework for electron configuration. Meanwhile, the Ulianov model provides a fresh perspective that could potentially explain anomalies unaddressed by the Pauling model and predict new chemical properties, despite its current lack of empirical validation. Concluding, while the Pauling model remains the standard for electron configuration, the Ulianov model’s innovative approach challenges existing paradigms and invites further investigation into its validity and potential applications in the scientific community.

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Kumar, Amit, Krishna Katuri, Piet Lens, and Dónal Leech. "Does bioelectrochemical cell configuration and anode potential affect biofilm response?" Biochemical Society Transactions 40, no. 6 (November 21, 2012): 1308–14. http://dx.doi.org/10.1042/bst20120130.

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Electrochemical gradients are the backbone of basic cellular functions, including chemo-osmotic transport and ATP synthesis. Microbial growth, terminal respiratory proteins and external electron transfer are major pathways competing for electrons. In BESs (bioelectrochemical systems), such as MFCs (microbial fuel cells), the electron flow can be via soluble inorganic/organic molecules or to a solid surface. The flow of electrons towards a solid surface can be via outer-membrane cytochromes or electron-shuttle molecules, mediated by conductive protein nanowires or extracellular matrices. In MECs (microbial electrolysis cells), the anode potential can vary over a wide range, which alters the thermodynamic energy available for bacteria capable of donating electrons to the electrode [termed EAB (electroactive bacteria)]. Thus the anode potential is an important electrochemical parameter determining the growth, electron distribution/transfer and electrical activity of films of these bacteria on electrodes. Different optimal applied potentials to anodes have been suggested in the literature, for selection for microbial growth, diversity and performance in biofilms on electrodes. In the present paper, we review the effects of anode potentials on electron-transfer properties of such biofilms, and report on the effect that electrochemical cell configuration may have on performance.

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McGarrah, D. B., and M. L. Brake. "Argon ion excitation by relativistic electrons: I. Collision cross sections and deposition efficiencies." Laser and Particle Beams 8, no. 3 (September 1990): 493–506. http://dx.doi.org/10.1017/s0263034600008739.

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Calculations of the electron impact excitation cross sections and deposition efficiencies for singly ionized argon with electrons of energies up to and including relativistic values have been made using the first Born approximation and the generalized oscillator formalism. Deposition efficiencies for fast electrons were generated from the Peterson and Green integral equation. Cross sections and efficiencies were produced for 29 transitions from the ground state configuration of Arii to excited energy levels with (Ne)3s23p44s and (Ne)3s23p43d configurations and for 40 transitions between excited energy levels from 4s and 3d to 4p orbitals. Efficiencies are constant for electron energies above 1 keV to 10 MeV. Electrons ejected from inner shells contribute up to 12% of the efficiency of the transition for electrons above 10 keV.

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Morehouse, Aaron, Kelton C. Ireland, and Gobinda C. Saha. "An Investigation into the Effects of Electric Field Uniformity on Electrospun TPU Fiber Nano-Scale Morphology." Micromachines 14, no. 1 (January 13, 2023): 199. http://dx.doi.org/10.3390/mi14010199.

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ANSYS Maxwell was used to replicate the conditions of two potential electrospinning configurations: a needle–plate and a parallel-plate configuration. Simulations showed that the electric field generated within the parallel-plate configuration was much more uniform than that within the needle–plate configuration. Both configurations were assembled and used electrospin fibers at three different spinning distances (10 cm, 12 cm, and 15 cm), at a consistent electric field strength of 1.7 kV/cm. Scanning electron microscopy was used to compare the morphologies of the fibers produced in both configurations in order to confirm whether a more uniform electric field yielded thinner fibers. The results show that the needle–plate configuration produced finer fibers than the parallel-plate configuration at all three spinning distances. However, there was no difference in the fiber diameters produced at the 12 and 15 cm spinning distances within the needle–plate configuration, implying thinning may only occur up to a certain distance in this configuration.

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Stojković, S. M., J. P. Šetrajčić, and Igor Vragović. "Electron Configuration of Carbon Nanotubes." Materials Science Forum 352 (August 2000): 129–34. http://dx.doi.org/10.4028/www.scientific.net/msf.352.129.

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Pe rez-Garrido, M. Ortun-O, A. M. S, A. "Configuration space in electron glasses." Philosophical Magazine B 81, no. 2 (February 1, 2001): 151–62. http://dx.doi.org/10.1080/13642810010009366.

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Tesi sul tema "Electron configuration"

Ozfidan, Asli Isil. "Electron-Electron Interactions in Optical Properties of Graphene Quantum Dots." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32857.

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In this thesis, I present a theory of electron-electron interactions in optical properties of graphene and transition metal dichalcogenides (TMDCs), two dimensional nanostructures with a hexagonal lattice. We start our discussion with electron-electron interactions in artificial rings for which the strength of interactions can be varied and exact results can be obtained. The artificial rings are described by the extended Hubbard model and solved using an exact diagonalization method in real and Fourier space of configurations. Exact and analytical results for charged rings are obtained in the limit of very strong interactions. For the quadruple quantum dot ring and the artificial benzene ring, we find that chirality leads to the appearance of a topological phase and an effective gauge field that determines the ground state character with varied interaction strength. For the charged artificial benzene ring, our numerical results show a transition from a degenerate to a non-degenerate ground state with increasing strength of Coulomb interactions. We show that the artificial gauge and the transition in the ground state can be detected as changes in the optical absorption spectrum. In the second part of the thesis, the electronic and optical properties of colloidal graphene quantum dots (CGQD) consisting of many benzene rings are determined. The CGQDs are described by the combination of tight binding, mean field Hartree Fock (HF) and Configuration Interaction methods. The single particle properties are described through the tight binding method based on the pz carbon orbitals. Screened Coulomb interactions between electrons, including direct, exchange, and scattering matrix elements, are calculated using Slater pz orbitals. HF ground states corresponding to semiconductor, Mott-insulator, and spin-polarized phases are obtained as a function of the strength of the screened interaction versus the tunnelling matrix element. The many-body ground and excited states in the semiconducting phase are constructed as a linear combination of a finite number of electron-hole pair excitations from the HF ground state (GS). The Hamiltonian is constructed in the subspace of multi-pair HF excitations to obtain the low energy, many body states by exact diagonalization using the Lanczos method. The degeneracy of the valence- and conduction-band edges of 3-fold rotationally symmetric CGQDs is shown to lead to a characteristic exciton and bi-exciton spectrum. The low-energy exciton spectrum is predicted to consist of two bright-singlet exciton states corresponding to two circular polarizations of light and a lower-energy band of dark singlets and dark triplets. The robustness of the bright degenerate singlet pair against correlations in the many-body state is demonstrated as well as the breaking of the degeneracy by the lowering of symmetry of the CGQD. Band edge biexciton energies and binding energies are predicted, and two degenerate exciton (X) states and a corresponding biexciton (XX) state are identified for the generation of an XX-X cascade. The Auger coupling of XX and excited X states is determined and our theoretical results are compared with experimental absorption and non-linear transient absorption spectra. In the third and final part of the thesis, we replace the two non-equivalent carbon atoms of the graphene hexagonal lattice with a heavy transition-metal atom M, (e.g. Mo or W) and a dimer X2 (e.g. S). The bandstructure of a monolayer MX2 is calculated using density functional theory (DFT). It is shown that a direct gap opens up at all K points of the Brillouin zone and strong spin orbit coupling leads to spin splitting of the valence and conduction bands and emergence of valley dependent optical selection rules. Finally, the magnetoluminescence experiments on a monolayer WS2 emitting circularly polarized light upon its excitation by unpolarized light are described. The emission of polarized light in zero magnetic field is explained by the possibility of formation of a valley polarized 2D electron gas in unintentionally doped WS2.

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Kimani, Peter Borgia Ndungu. "Electronic structure and electron correlation in weakly confining spherical quantum dot potentials." abstract and full text PDF (free order & download UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3307466.

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Reyes, Vasquez David Fernando. "Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30356/document.

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Les nanofils magnétiques suscitent un intérêt considérable depuis une quinzaine d'années en raison de leur utilisation potentielle pour la spintronique. Leur utilisation potentielle dans des dispositifs exige une description détaillée des états magnétiques locaux des nanofils. Dans cette thèse, j'ai étudié qualitativement et quantitativement les états magnétiques à l'état rémanent de nanofils magnétiques par holographie électronique (EH) et simulations micromagnétiques. Une analyse détaillée a été réalisée sur deux types de nanofils : multicouches Co/Cu et nanofils FeCoCu à diamètre modulé. Les deux systèmes ont été synthétisés par électrodéposition dans des membranes. La combinaison des caractérisations magnétiques, structurales et chimiques locales obtenues dans un TEM avec des simulations micromagnétiques ont permis une description complète de ces systèmes. Pour les nanofils multicouches Co / Cu, j'ai analysé l'influence des épaisseurs de cobalt et de cuivre ou de la structure cristalline de Co sur la configuration magnétique de nanofils isolés. Après l'application d'un champs de saturation dans des directions parallèle et perpendiculaire à l'axe des nanofils, j'ai étudié les configurations magnétiques pour les épaisseurs de Co / Cu suivantes : 25nm / 15nm, 25nm / 45nm, 50nm / 50nm et 100nm / 100nm. Trois configurations principales à la rémanence ont été trouvées : (i) un couplage antiparallèle entre les couches Co, (ii) une structure mono-domaine et (iii) un état vortex. Dans les nanofils Co (25 nm) / Cu (15 nm), en fonction de la direction du champ de saturation, les couches de Co peuvent présenter soit un couplage antiparallèle (champ de saturation perpendiculaire) ou un couplage de type vortex (champ de saturation en parallèle) avec un coeur aligné parallèlement à l'axe du fil. Cependant, 10% des nanofils étudié présente un état mono-domaine quel que soit le champ de saturation parallèle et perpendiculaire. Dans le cas Co (50 nm) / Cu (50 nm) et Co (25 nm) / Cu (45 nm), l'épaisseur plus grande de Cu séparant les couches ferromagnétiques réduit l'interaction magnétique entre des couches de Co voisines. L'état rémanent est donc formé de la combinaison de couches de Co monodomaines orientés perpendiculairement à l'axe du fil et de certains états vortex. Enfin pour la configuration Co (100 nm) / Cu (100 nm), un état monodomaine est observé quel que soit la direction du champ appliqué lors de la saturation. Toutes ces configurations magnétiques ont été déterminées et simulées à l'aide des calculs micromagnétiques jusqu'à ce qu'un accord quantitatif avec les résultats expérimentaux aient été obtenus. J'ai ainsi pu expliquer l'apparition et la stabilité de ces configurations en fonction des principaux paramètres magnétiques tels que l'échange, la valeur et la direction de l'anisotropie et l'aimantation. La comparaison entre les simulations et les résultats expérimentaux ont ainsi servi à déterminer précisément la valeur de ces paramètres. Dans les nanofils FeCoCu à diamètre modulé, une description détaillée de l'influence de la géométrie sur la configuration locale de spins a été réalisée. Les expériences d'holographie électronique montrent une structure magnétique monodomaines avec l'aimantation alignée longitudinalement. Cependant, nous avons trouvé grâce à des simulations micromagnétiques que cette configuration monodomaine est fortement affectée par la variation locale du diamètre. L'étude en particulier du champ de fuite mais aussi du champ démagnétisant à l'intérieur des nanofils a mis en évidence le rôle prépondérant des charges magnétiques aux zones de variation de diamètre. De plus l'aimantation présente une structure plus compliquée qu'un simple alignement le long de l'axe du fil. Enfin les résultats que j'ai obtenus ont abouti à une interprétation différente d'expériences précédentes en MFM<br>Magnetic nanowires have raised significant interest in the last 15 years due to their potential use for spintronics. Technical achievements require a detailed description of the local magnetic states inside the nanowires at the remnant state. In this thesis, I performed quantitative and qualitative studies of the remnant magnetic states on magnetic nanowires by Electron Holography (EH) experiments and micromagnetic simulations. A detailed investigation was carried out on two types of nanowires: multilayered Co/Cu and diameter-modulated FeCoCu nanowires. Both systems were grown by template-based synthesis using electrodeposition process. The combination of local magnetic, structural and chemical characterizations obtained in a TEM with micromagnetic simulations brought a complete description of the systems. In the multilayered Co/Cu nanowires, I analysed how different factors such as the Co and Cu thicknesses or the Co crystal structure define the remnant magnetic configuration into isolated nanowires. After applying saturation fields along directions either parallel or perpendicular to the NW axis, I studied multilayered Co/Cu nanowires with the following relative Co/Cu thickness layers: 25nm/15nm, 25nm/45nm, 50nm/50nm, and 100nm/100nm. Three main remnant configurations were found: (i) antiparallel coupling between Co layers, (ii) mono-domain-like state and (iii) vortex state. In the Co(25 nm)/Cu(15 nm) nanowires, depending on the direction of the saturation field, the Co layers can present either an antiparallel coupling (perpendicular saturation field) or vortex coupling (parallel saturation field) with their core aligned parallel to the wire axis. However, 10% of the nanowires studied present a mono-domain-like state that remains for both parallel and perpendicular saturation fields. In the Co(50 nm)/Cu(50 nm) and Co(25 nm)/Cu(45 nm) nanowires, a larger Cu thickness separating the ferromagnetic layers reduces the magnetic interaction between neighbouring Co layers. The remnant state is hence formed by the combination of monodomain Co layers oriented perpendicularly to the wire axis and some tilted vortex states. Finally for the Co(100 nm)/Cu(100 nm) nanowires a monodomain-like state is found no matters the direction of the saturation field. All these magnetic configurations were determined and simulated using micromagnetic calculations until a quantitative agreement with experimental results has been obtained. I was able to explain the appearance and stability of these configurations according to the main magnetic parameters such as exchange, value and direction of the anisotropy and magnetization. The comparison between simulations and experimental results were used to precisely determine the value of these parameters. In the diameter-modulated cylindrical FeCoCu nanowires, a detailed description of the geometry-induced effect on the local spin configuration was performed. EH experiments seem to reveal that the wires present a remnant single-domain magnetic state with the spins longitudinally aligned. However, we found through micromagnetic simulations that such apparent single-domain state is strongly affected by the local variation of the diameter. The study of the leakage field and the demagnetizing field inside the nanowire highlighted the leading role of magnetic charges in modulated areas. The magnetization presents a more complicated structure than a simple alignment along the wire axis. Finally my results have led to a new interpretation of previous MFM experiments

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Bridges, Craig Allan Greedan John E. "Structural and electronic properties of BaV10O15, BaV10-xTixO15, and BaVO3-x /." *McMaster only, 2002.

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Sans, Aguilar Juan R. "Four dimensional analysis of free electron lasers in the amplifier configuration." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FSans%5FAguilar.pdf.

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Thesis (M.S. in Applied Science)--Naval Postgraduate School, December 2007.<br>Thesis Advisor(s): Colson, William B. "December 2007." Description based on title screen as viewed on January 18, 2008. Includes bibliographical references (p. 63). Also available in print.

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Napier, Stuart A. "Electron correlation and spin-dependent effects in the electron impact excitation of zinc atoms." University of Western Australia. School of Physics, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0098.

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[Truncated abstract] This work investigated electron correlation and spin-dependent effects in electron scattering from zinc for incident electron energies from the lowest excitation threshold at 4.003 eV to 50 eV. Experiments were performed using a crossed-beams electron impact spectrometer, which included an unpolarised electron gun, and also a spin-polarised electron gun. The apparatus was tested, and shown to be operating well, by repeating past studies of electron scattering from helium and argon. Emission cross sections for the 4s4p 3P1, 4s4p 1P1, 4s5s 3S1, 4s4d; 5d; 6d 3D1;2;3 and 4s4d; 5d 1D2 states were measured from the respective thresholds to 50 eV. These were compared with Convergent Close-Coupling (CCC) and B-spline R-matrix (BSRM) calculations of the 4s4p 3P1, 4s4p 1P1, 4s5s 3S1, 4s4d 1D2 and 4s4d 3D1;2;3 emission cross sections. There are serious discrepancies between the theories, and between the theories and experiment, which indicates strong continuum coupling and innershell excitation effects in the electron excitation of zinc. The differential elastic scattering signal at scattering angles of 30 , 54 , 90 and 110 was measured for incident electron energies from just below the lowest excitation threshold at 4.003 eV, to the ionisation threshold at 9.394 eV. Some assignments given by Sullivan et al [1] and Zatsarinny and Bartschat [2] were confirmed by the present experiment. An area of disagreement in the literature concerning the nature of a feature observed at the 4s4p 1P1 threshold at 5.796 eV was resolved in favour of Zatsarinny and Bartschat, who assign the feature as a cusp. ... Below the ionisation threshold, the 4s4p 3P1 photon excitation function supports the assignment of the near-4s4p 1P1 threshold feature as a cusp. Some of the overlapping negative-ion resonances which were observed near 7.5 eV in the 4s4p 3P1, 4s4p 1P1 and 4s5s 3S1 photon excitation functions were assigned with the assistance of the BSRM calculations of Zatsarinny and Bartschat. However, continuum coupling effects above 8 eV seem to cause the theoretical negative-ion resonance predictions to break down. Above the ionisation threshold, the near-11 eV negative-ion resonance effects depend on the configuration n, L and S of the neutral state excitation observed. This may be due to the properties of the mixed negative ion component states. Postcollision interaction (PCI) effects the 4s5s 3S1, 4s4d; 5d; 6d 3D1;2;3 and 4s4d; 5d 1D2 photon excitation functions. The PCI mechanism can populate the 4s4d; 5d; 6d 3D1;2;3 and 4s4d; 5d 1D2 states because the scattered and ejected electrons have a similar energy, and can thus exchange a large amount of orbital angular momentum. The present work demonstrates that electron correlation effects, especially those associated with innershell excitation, are very significant in electron scattering from zinc. Existing theoretical models of electron scattering from zinc inadequately treat electron correlations, and as a result of this are inaccurate, as shown here. The studies presented here should guide the development of models that accurately describe the innershell excitation effects, which are important for zinc and a great many other atoms.

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Sloggett, Clare Physics Faculty of Science UNSW. "Electron correlations in mesoscopic systems." Awarded by:University of New South Wales. School of Physics, 2007. http://handle.unsw.edu.au/1959.4/31875.

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This thesis deals with electron correlation effects within low-dimensional, mesoscopic systems. We study phenomena within two different types of system in which correlations play an important role. The first involves the spectra and spin structure of small symmetric quantum dots, or &quoteartificial atoms&quote. The second is the &quote0.7 structure&quote, a well-known but mysterious anomalous conductance plateau which occurs in the conductance profile of a quantum point contact. Artificial atoms are manufactured mesoscopic devices: quantum dots which resemble real atoms in that their symmetry gives them a &quoteshell structure&quote. We examine two-dimensional circular artificial atoms numerically, using restricted and unrestricted Hartree-Fock simulation. We go beyond the mean-field approximation by direct calculation of second-order correlation terms; a method which works well for real atoms but to our knowledge has not been used before for quantum dots. We examine the spectra and spin structure of such dots and find, contrary to previous theoretical mean-field studies, that Hund's rule is not followed. We also find, in agreement with previous numerical studies, that the shell structure is fragile with respect to a simple elliptical deformation. The 0.7 structure appears in the conductance of a quantum point contact. The conductance through a ballistic quantum point contact is quantised in units of 2e^2/h. On the lowest conductance step, an anomalous narrow conductance plateau at about G = 0.7 x 2e^2/h is known to exist, which cannot be explained in the non-interacting picture. Based on suggestive numerical results, we model conductance through the lowest channel of a quantum point contact analytically. The model is based on the screening of the electron-electron interaction outside the QPC, and our observation that the wavefunctions at the Fermi level are peaked within the QPC. We use a kinetic equation approach, with perturbative account of electron-electron backscattering, to demonstrate that these simple features lead to the existence of a 0.7-like structure in the conductance. The behaviour of this structure reproduces experimentally observed features of the 0.7 structure, including the temperature dependence and the behaviour under applied in-plane magnetic fields.

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吳潔貞 and Kit-ching Betty Ng. "Correlation effects in crystal field splitting." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31230714.

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Ng, Kit-ching Betty. "Correlation effects in crystal field splitting /." [Hong Kong : University of Hong Kong], 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12323342.

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Temperley, J. "Electron spin resonance studies of early d-transition metal compounds with a d#1#-configuration." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382736.

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Più fonti

Libri sul tema "Electron configuration"

K, Wilson Angela, Peterson Kirk A, American Chemical Society. Division of Physical Chemistry., and American Chemical Society. Division of Computers in Chemistry., eds. Electron correlation methodology. Washington, DC: American Chemical Society, 2007.

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Göres, Jörn. Correlation effects in 2-dimensional electron systems: Composite fermions and electron liquid crystals. Stuttgart: Max-Planck-Institut für Festkörperforschung, 2004.

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March, Norman H. Electron correlation in molecules and condensed phases. New York: Plenum Press, 1996.

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1945-, Gonis Antonios, Kioussis Nicholas, Ciftan Mikael, and International Workshop on Electron Correlations and Materials Properties (1st : 1998 : Crete, Greece), eds. Electron correlations and materials properties. New York: Kluwer Academic/Plenum Publishers, 1999.

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Matsen, F. A. The unitary group in quantum chemistry. Amsterdam: Elsevier, 1986.

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1950-, Wilson S., ed. Electron correlation in atoms and molecules. New York: Plenum Press, 1987.

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H, McGuire J. Electron correlation dynamics in atomic collisions. Cambridge: Cambridge University Press, 1997.

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Gordon Godfrey Workshop on Condensed Matter Physics (1991 University of New South Wales). Strongly correlated electron systems: Proceedings of the Gordon Godfrey Workshop on Condensed Matter Physics. Commack, N.Y: Nova Science Publishers, 1992.

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Greenspan, Donald. Computer experiments for molecular motions and chemical bonding. Arlington, Tex: University of Texas at Arlington, Dept. of Mathematics, 1995.

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Whelan, Colm T. (E,2e) & related processes. Dordrecht: Springer, 1993.

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Più fonti

Capitoli di libri sul tema "Electron configuration"

Davidson, Ernest R. "Configuration Interaction Wave Functions." In Relativistic and Electron Correlation Effects in Molecules and Solids, 105–31. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1340-1_5.

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Karwowski, Jacek. "The Configuration Interaction Approach to Electron Correlation." In NATO ASI Series, 65–98. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-7419-4_6.

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Handy, Nicholas C. "Full Configuration Interaction and Møller-Plesset Theory." In Relativistic and Electron Correlation Effects in Molecules and Solids, 133–60. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1340-1_6.

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Pindzola, Michael S., Donald C. Griffin, and Christopher Bottcher. "Electron-Ion Collisions in the Average-Configuration Distorted-Wave Approximation." In Atomic Processes in Electron-Ion and Ion-Ion Collisions, 75–91. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-5224-2_3.

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Sasaki, F., M. Sekiya, T. Noro, K. Ohtsuki, and Y. Osanai. "Non-Relativistic Configuration Interaction Calculations for Many-Electron Atoms: ATOMCI." In Modem Techniques in Computational Chemistry: MOTECC-91, 115–66. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3032-5_3.

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Knowles, Peter J. "Electron Correlation in Small Molecules and the Configuration Interaction Method." In Supercomputational Science, 211–33. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5820-6_17.

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Sasaki, F., M. Sekiya, T. Noro, K. Ohtsuki, and Y. Osanai. "Non-Relativistic Configuration Interaction Calculations for Many-Electron Atoms: ATOMCI." In Modern Techniques in Computational Chemistry: MOTECC™-90, 181–234. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2219-8_4.

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Christoffersen, Ralph E. "Computational Techniques for Many-Electron Systems Using Single Configuration Wavefunctions." In Basic Principles and Techniques of Molecular Quantum Mechanics, 481–575. New York, NY: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-6360-6_11.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of monocyclopentadienyl molybdenum(II) complex with 16-electron configuration." In Magnetic Properties of Paramagnetic Compounds, 447–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_251.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of monocyclopentadienyl molybdenum(II) complex with 16-electron configuration." In Magnetic Properties of Paramagnetic Compounds, 449. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_252.

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Atti di convegni sul tema "Electron configuration"

Mezey, Kinga-Noémi, and Csilla Sógor. "MOTIVATING MINDS: THE IMPACT OF A SERIOUS BOARD GAME ON ELECTRON CONFIGURATION LEARNING." In 19th International Technology, Education and Development Conference, 6767–74. IATED, 2025. https://doi.org/10.21125/inted.2025.1740.

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Paterna, Giuseppe, Giorgia Comparato, Giuseppe Lipari, Eleonora Traina, Antonino Muratore, Alessandro Busacca, Patrizia Livreri, and Salvatore Stivala. "Comparison Between Halbach Array and Periodic Permanent Magnet Circuit Configuration." In 2024 Joint International Vacuum Electronics Conference and International Vacuum Electron Sources Conference (IVEC + IVESC), 01–02. IEEE, 2024. http://dx.doi.org/10.1109/ivecivesc60838.2024.10694882.

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Ekielski, Marek, Magdalena Zadura, Karolina Bogdanowicz, Anna Szerling, Weronika Głowadzka, Tomasz Czyszanowski, Borislav Petrovic, Andreas Bader, Fabian Hartmann, and Sven Höfling. "Monolithic high contrast grating integrated with metal as a transparent electrode for ICLED devices." In CLEO: Applications and Technology, JTh2A.205. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jth2a.205.

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In this paper we present results of metalMHCG fabrication for GaSb-based ICLED by means of electron beam lithography, e-beam metal evaporation and plasma etching process. Configuration of metalMHCG was designed to maximize transmittance of TE polarized light in the mid-infrared wavelength region.

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Dutilleul, Thomas, Robert Widdison, James Connell, John Crossley, Mark Albert, and David Gandy. "Complex Linear Welding Development for Thick Section Electron Beam Welding for Pressure Vessel Applications." In AM-EPRI 2024, 183–94. ASM International, 2024. http://dx.doi.org/10.31399/asm.cp.am-epri-2024p0183.

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Abstract As part of a Department of Energy (DOE) funded program assessing advanced manufacturing techniques for Small Modular Reactor (SMR) applications, the Nuclear Advanced Manufacturing Research Centre (AMRC) and the Electric Power Research Institute (EPRI) have been developing Electron Beam Welding (EBW) parameters and procedures based upon SA508 Grade 3 Class 1 base material. The transition shell, a complex component connecting the lower assembly to the upper assembly is a shell that flares up with varying thicknesses across its section. The component due to its geometry could be built by near net shape powder metallurgy hot isostatic pressing instead of conventional forging techniques. The demonstrator transition shell here is built from several sub-forging as a training exercise. The complex geometry and joint configuration were selected to assess the EBW as a suitable technique. This paper presents results from the steady state welding in the 60-110 mm material thickness range, showing that weld properties meet specification requirements. Weld quality was assured by Time-of-Flight Diffraction (ToFD). The transition shell was completed by welding a flange to the assembly. The presented transition shell assembly represents 6 welded sections all fabricated in below 100 min total welding time.

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Jain, F. C., J. J. Rosato, K. S. Kalonia, and V. S. Agarwala. "Formation of an Active Electronic Barrier at Al-Semiconductor Interfaces: a Novel Approach in Corrosion Prevention." In CORROSION 1986, 1–13. NACE International, 1986. https://doi.org/10.5006/c1986-86195.

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Abstract Aluminum surfaces exhibit significantly improved corrosion protection when they are coated with suitable semi-conductor/insulator thin films. These coatings, generally realized in Metal- Semiconductor (MS) or Metal-Insulator- Semiconductor (MIS) structural configurations, give rise to an interfacial electric field which acts as an effective built-in electronic barrier. This active barrier significantly impedes the transfer of electrons from the aluminum surface to foreign species which cause oxidation by accepting the electrons. Anodic polarization data on numerous samples fabricated in both MS [e.g. Al- Indium Tin Oxide (ITO)] and MIS [e.g. Al-SiO2–ITO] configurations have demonstrated the protective nature of the built-in active electronic barrier. The electronic barrier heights have been shown to increase with: (1) the presence of a thin (20-100Å) SiO2 layer at the metal-semiconductor interface; and (2) the energy gap of ITO which depends upon the indium content. A comparison of these results with data obtained on plasma- deposited Al-Si3N4 samples is also presented.

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Singh, Ambrish. "Pyran Derivatives as Acidizing Corrosion Inhibitors for N80 Steel in Hydrochloric Acid: Theoretical and Experimental Approaches." In CORROSION 2019, 1–44. NACE International, 2019. https://doi.org/10.5006/c2019-12835.

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Absrract The corrosion inhibition performance of pyran derivatives (AP) on N80 steel in 15% HCl was investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, weight loss, contact angle and scanning electron microscopy (SEM) measurements, DFT and molecular dynamic simulation. The adsorption of APs on the surface of N80 steel obeyed Langmuir isotherm. Potentiodynamic polarization study confirmed that inhibitors are mixed type with cathodic predominance. Molecular dynamic simulation was applied to search for most stable configuration and adsorption energies for the interaction of the inhibitors with Fe (110) surface. The theoretical data obtained are in most cases in agreement with experimental results.

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McVey, B. D., J. C. Goldstein, K. Lee, and B. E. Newnam. "Optical Physics of an XUV Free-Electron Laser*." In Short Wavelength Coherent Radiation: Generation and Applications. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/swcr.1986.tue14.

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The optical physics of an XUV free-electron laser oscillator configuration driven by an RF linac is investigated. Some of the topics discussed are optical beam quality, methods of output coupling, ring resonator configurations, and the expected optical spectrum. The tool used to investigate these physics issues is the computer code, FELEX. FELEX simulates a three-dimensional FEL oscillator configuration. The electron beam is modelled by following individual electron trajectories including deceleration by the light wave, betatron motion, and external focussing due to quadrupole coils. The electron beam parameters used in the simulations are those believed to be scalable from present RF linac experiments. The optical beam is modelled by solving the paraxial wave equation on a square grid. After interaction with the electron beam in the wiggler region, the optical beam is propagated through the resonator cavity to the wiggler entrance where the interaction with a new pulse of electrons is initiated. Initial 3-D simulations at 82nm indicate strong distortions of the optical beam from the idealized Gaussian. Further, multiple pass calculations appear necessary to accurately determine the small signal gain. Finally, the optical spectrum is investigated using a one-dimensional periodic code.

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Williamson, S., and G. Mourou. "Picosecond Electro-Electron Optic Oscilloscope." In Picosecond Electronics and Optoelectronics. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/peo.1985.pdp2.

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The technique of picosecond electro-optic sampling for time-resolving ultrafast electrical transients is presently the only means by which an electrical waveform can be measured with single picosecond resolution. In addition, the electro-optic sampling oscilloscope is capable of millivolt sensitivity and can be used in a contactless configuration, a feature that will enable the rapid characterization of packaged electronic circuits or 2-dimensionai mapping of electric fields. The major drawback of the electro-optic sampling oscilloscope is that it requires a short pulse laser system. The complexity of such a laser system results in a sampling oscilloscope that is delicate, maintenance intensive, and expensive, precluding its development in all but a few large laboratories.

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Henderson, Gregory N., Thomas K. Gaylord, Elias N. Glytsis, Phillip N. First, and William J. Kaiser. "Testing multilayer semiconductor electron wave devices using ballistic electron emission microscopy." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thf4.

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Ballistic electron emission microscopy (BEEM) has recently been developed to study the electrical properties of buried interfaces where ballistic electrons are injected into a sample using a scanning tunneling microscope. In this paper, a method is proposed that uses the BEEM technique to observe electron wave optical properties of ballistic transport in semiconductors. This method provides a three-terminal configuration for characterizing electron wave devices that overcomes many of the problems encountered in traditional two- and three-terminal techniques. Specifically, the method provides a highly collimated beam of ballistic carriers with a precisely controlled energy distribution. These carriers probe the quantum transmittance of a voltage- tunable electron wave interference device with minimal impurity scattering. A general procedure is presented for analyzing this experimental configuration based on a combination of the models used to describe BEEM and ballistic electron transport in semiconductors.

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Makarenko, Olena, Iryna Podchernyaeva, and Olha Hetman. "Application of Samsonov’s configuration model in establishing the influence of the electronic structure of d-metals on thermal electron emission of WBa cathodes." In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-om7404.

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Electron emission from WBa-cathodes is carried out from an adsorbed layer of barium and oxygen atoms on W or other d-metal adsorbents. When films of the d-metals Re, Os, Ir and Ru are deposited on the emitting surface, the work function φ decreases by 0.2 eV; and in the case of Pt, Pd and Au, it increases by 0.2 eV. The aim of the work is determine the effect of the electronic structure of d-metals on the work function of the WBa cathode using the Samsonov configuration model. According to Samsonov’s configuration model, the formation of a condensed state is accompanied by the division of valence electrons into two subsystems: localized and itinerant electrons. Free-filled and half-filled configurations such as s2, s2р6, d0, d5, d10 are the most energetically stable in the spectrum of configurations.According to Samsonov’s model, oxygen atoms are electron acceptors, since they tend to fill the valence orbitals 2s22p4 with electrons in the energetically more stable state of 2s22p6. Ba atoms are electron donors, donating their 6s2 valence electrons to oxygen to form surface dipoles Ba+– O- with ionic bonds. These dipoles reduce the work function of W. Re, Os, Ir and Ru atoms have unpaired electrons in the orbitals d6 and d7, which, upon energy absorbing, transform into sp-valence states and can be electron donors, ensuring the maximum population of sp - states of oxygen. As a result, the degree of polarizability of Ba+ – O- dipoles on the surface of these adsorbents increases, which further reduces φ. Pt, Pd and Au atoms with stable d9 and d10 orbitals have a reduced donor ability and do not have the effect of reducing the work function. Сonclusion. The main mechanism of emission of WBa cathodes is the donor-acceptor interaction of adsorbed atoms among themselves and with the adsorbent, leading to the formation of polarized dipoles responsible for the escape of electrons into vacuum.

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Rapporti di organizzazioni sul tema "Electron configuration"

Y. Raitses, D. Staack, A. Smirnov, A.A. Litvak, L.A. Dorf, T. Graves, and and N.J. Fisch. Studies of Non-Conventional Configuration Closed Electron Drift Thrusters. Office of Scientific and Technical Information (OSTI), September 2001. http://dx.doi.org/10.2172/788220.

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Gu, Xiaofeng, A. Blednykh, M. Blaskiewiscz, and S. Verdu-Andres. MBTRACK2 - APPLICATION ON EIC 5GEV ELECTRON RING REVERSE PHASE CONFIGURATION. Office of Scientific and Technical Information (OSTI), January 2024. http://dx.doi.org/10.2172/2281584.

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Rej, D. J. Electron temperature measurements of field-reversed configuration plasmas on the FRX-C/LSM experiment. Office of Scientific and Technical Information (OSTI), September 1989. http://dx.doi.org/10.2172/5866713.

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Alan H. Glasser and Samuel A. Cohen. Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotating Odd-parity Magnetic Fields. Office of Scientific and Technical Information (OSTI), April 2001. http://dx.doi.org/10.2172/786570.

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Glasser, A. H., and S. A. Cohen. Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotation Odd-parity Magnetic Fields (RMF[subscript o]). Office of Scientific and Technical Information (OSTI), April 2001. http://dx.doi.org/10.2172/781483.

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Karpius, Peter. Electron Configurations and Basic Chemical Bonding. Office of Scientific and Technical Information (OSTI), October 2020. http://dx.doi.org/10.2172/1679981.

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Tang, C. M., P. Sprangle, A. Ting, and B. Hafizi. Radio Frequency Linac Driven Free-Electron Laser Configurations. Fort Belvoir, VA: Defense Technical Information Center, September 1989. http://dx.doi.org/10.21236/ada212572.

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Speller, Leslie C., and Arthur N. Thorpe. Feasibility of Investigating Smith-Purcell Free-Electron Laser Configurations by Electron Energy Loss Studies. Fort Belvoir, VA: Defense Technical Information Center, June 1986. http://dx.doi.org/10.21236/ada169059.

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Jiang, Yuxiang. Unsettled Technology Areas in Electric Propulsion Systems. SAE International, May 2021. http://dx.doi.org/10.4271/epr2021012.

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Electric vehicle (EV) transmission technology—crucial for battery electric vehicles (BEVs) and hybrid electric vehicles (HEVs)—is developing quickly and customers want good performance at a low cost. Single-speed gearboxes are popular in electric drive systems due to their simple and cost-effective configuration. However, multispeed gearboxes are being taken to market due to their higher low-speed torque, dynamic performance, and energy efficiency. Unsettled Technology Areas in Electric Propulsion Systems reviews the economic drivers, existing techniques, and current challenges of EV transmission technology—including torque interruption during shifting; thermal and sealing issues; and noise, vibration, and harshness (NVH). This report discusses the pros and cons for both single-speed and multispeed gearboxes with numerical analysis.

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Welch, D. R., S. A. Cohen, T. C. Genoni, and A. H. Glasser. Formation of Field-reversed-Configuration Plasma with Punctuated-betatron-orbit Electrons. Office of Scientific and Technical Information (OSTI), June 2010. http://dx.doi.org/10.2172/984348.

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