9,921 research outputs found
The analyses on the surface properties of the annealed-diamond membrane
No full textPolycrystalline diamond films were deposited using methane/hydrogen gas mixture on silicon substrates by a microwave plasma chemical vapor deposition (MPCVD) system. From X-ray photoelectron spectroscopy (XPS) analysis, the oxygen & the C signals were observed for the as-deposited diamond film. The oxygen signal was due to physiosorbed water or weakly bound oxygen species. After the 800 8C annealing process, the Si/Si (99.8 eV), Si/O (102.8 eV), Si/Ox (104.8 eV) & the C/O (286.5 eV) bonds appeared for the surface of the diamond film. Moreover, it was shown that the film quality was improved by the 800 8C annealing process. However, it was found that the oxygen signal decreased & the silicon & silicon/oxide bonds almost disappeared for the
top surface of the annealed-diamond membrane. It was suggested the oxidized dangling bonds & the silicon components on diamond crystallite surfaces were etched away partly by back-etching process. Furthermore, from Auger electron spectroscopy (AES) analyses, the oxygen & the silicon signals were approximately estimated to be more than 1100 A ° from the bottom surface of annealed-diamond membrane. This indicated that the non-diamond components (included the SiC, SiO2 & amorphous carbon, etc.) in the diamond/silicon interface might be thermally diffused through the grain boundaries to the top surface of the annealeddiamond membrane. These findings may be influential in the development on the characteristic of diamond electrical devices in the future
Bohr space in six dimensions
No full textAbstractA conformal factor in the Bohr model embeds Bohr space in six dimensions, revealing the O(6) symmetry and its contraction to the E(5) at infinity. Phenomenological consequences are discussed after the re-formulation of the Bohr Hamiltonian in six dimensions on a five sphere
Pauli letter collection: letter to Wolfgang Pauli
No full textPauli's last letter was in every respect a cause of great pleasure to Bohr. First of all Bohr and his wife sends Pauli their heartiest congratulations on his approaching wedding and they look forward to having Pauli and his wife on a small visit in their home. The week after Easter would be very suitable, and Bohr hopes that they will feel comfortable in Carlsberg in spite of the columns. Both Rosenfeld and Klein, who is in Copenhagen on a visit, as well as Bohr, were very interested in Pauli's remarks. Bohr will take Pauli's proposals into consideration when the proofs arrive. The unknown author of the first appendix writes that he agrees very much with the contents of Bohr's manuscript and his letters to Pauli. By contrast his view about the problem of the infinite self-energy is somewhat different from what Bohr writes on this subject
Bohr Model of Atom
Full text linkTitle: Bohr Model of Atom Author: Lukáš Hřebík Department: Department of Physics Education Supervisor: RNDr. Zdeňka Koupilová, Ph.D., Department of Physics Education Abstract: This bachelor thesis focuses on the Bohr model of atom from 1913. In addition to this model, the models that preceded it, especially the Thomson model and the Rutherford model, are also briefly discussed. In the case of the Rutherford model, the stability calculation of the atom thus described is given. There are the original derivations from historical articles that will help readers understand the development of the Bohr model. The whole thesis is set in a physical-historical context. Both the physical phenomena that this model helped to clarify and those that it could not explain are mentioned here. The aim of the work is to acquaint the reader with the overall "life" of the Bohr model, from its inception through its development to its abandonment. Keywords: model of atoms, Bohr model of atom, study tex
Bohr compactification of separable locally convex spaces
Full text linkIt is not well-known that for each separable real locally convex space, its Bohr compactification is isomorphic as a topological group to the Bohr compactification of the topological group R of all real numbers. This is the case for each separable real Banach space. In this expository research note, we state the results explicitly and provide accessible proofs. © 2025 the Author(s). All rights reserved
Bohr Misunderstood Heisenberg's Motivation
No full textIn response to an article by Frederick Seitz some details of the background, the course of events, and the aftermath with respect to Heisenberg's visit to Bohr in 1941 are described, as explained to the author by Heisenberg himself and by von Weizsaecker
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