bohr niels henry moseley (3 Ergebnisse)

Hardcover. Zustand: Very Good. 1st Edition. MOSELEY, Henry Gwyn Jeffreys. The high-frequency spectra of the elements / The High-Frequency Spectra of the Elements. Part II. In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Sixth series, vol.26, no. 156 (December 1913), pp. 1024-1034, plate XXIII; and Sixth series, vol.27, no. 160 (April 1914), pp. 703-713. [Bound with]: II. BOHR, Niels. On the Constitution of Atoms and Molecules. 3 parts. In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Sixth series, vol.26 (July-December 1913), pp. 1-25, 476-502 and 857-75. London: Taylor and Francis, 1913-1914. 2 volumes, 8vo (210x140 mm). Whole volumes: viii, 1064 pp., 23 plates, Sept. issue misbound at end; viii, 1044 pp., 16 plates. Contemporary half cloth (spine sun-faded, boards somewhat rubbed and scuffed). Rear inner joint of vol. 26 broken; endpapers with library stamps, title stamped, slightly browned. Margins of some plates occasionally shaved (not affecting plate to Meseley's paper). Provenance: Bundesamt für Eich- und Vermessungswesen (bookplates with shelf numers to front pastedowns and stamps to general title pages). Good set with the important milestone papers. ---- I. DSB IX, 542; PMM 407; Norman 1559 - FIRST EDITION of Moseley's breakthrough work which placed the atomic table on a firm scientific foundation. "Moseley, working under Rutherford at Manchester, used the method of X-ray spectroscopy devised by the Braggs to calculate variations in the wavelength of the rays emitted by each element. These he was able to arrange in a series according to the nuclear charge of each element. Thus if the nuclear charge of hydrogen is 1, in helium it is 2, in lithium 3, and so on by regular progression to uranium as 92. These figures Moseley called atomic numbers. He pointed out that they also represented a corresponding increase in extra-nuclear electrons and that it is the number and arrangement of these electrons rather than the atomic weight that determines the properties of an element. It was now possible to base the periodic table on a firm foundation, and to state with confidence that the number of elements up to uranium is limited to 92. When Moseley's table was completed, six atomic numbers had no corresponding elements; but Moseley himself was able to predict the nature of four of the missing elements" (PMM 407) II. DSB II, 239; PMM 411; Norman 258 - FIRST EDITION."Bohr's three-part paper postulated the existence of stationary states of an atomic system whose behavior could be described using classical mechanics, while the transition of the system from one stationary state to another would represent a non-classical process accompanied by emission or absorption of one quantum of homogeneous radiation, the frequency of which was related to its energy by Planck's equation" (Norman).

Couverture rigide. Zustand: Bon. 1064 pp. 24 pl. Londres, Taylor and Francis, juillet - décembre 1913, in-4, 1064 pp. 24 pl, Broché, couverture imprimée de l'éditeur, Fort volume réunissant les numéros 151 à 156 de cette revue scientifique de premier ordre, fondée en 1798 par le naturaliste anglais Richard Taylor. Il contient, en édition originale, l'article de Niels Bohr "On the Constitution of Atoms and Molecules" en trois parties (n° 151, 153 et 155) ; Ernest Rutherford, en collaboration avec son élève H. Richardson, pour "Analysis of the Gamma Rays from Radium D and Radium E" (n° 152) et "Analysis of the Gamma Rays of the Thorium and Actinium products" (n° 156) ; ainsi que l'article d'Henry G.J. Moseley "The High-Frequency Spectra of the Elements" (n° 156) : ? Niels Bohr (1885 1962), "On the Constitution of Atoms and Molecules" : dans ce texte fondamental sur la constitution des atomes et des molécules, le scientifique danois met au point sa théorie qui refonde le modèle de l'atome de Rutheford, alors en usage. Il introduit la notion d'état stationnaire des électrons, joint le modèle de l'atome de Rutherford à la théorie quantique de Planck et invente ainsi le modèle de Bohr, qui, bien qu'il ait été révisé depuis, a permis d'autres découvertes scientifiques également importantes. ? Ernest Rutherford (1871-1937), "Analysis of the Gamma Rays from Radium D and Radium E" et "Analysis of the Gamma Rays of the Thorium and Actinium products" : le physicien néo-zélandais publie ici ses recherches à propos des rayons gamma provenant du radium D et radium E puis du thorium et de l'actinium. Il a créé le nom de rayonnement gamma et les a déjà divisés en deux groupes en fonction de leur puissance pénétrante. ? Henry Moseley (1887-1915), "The High-Frequency Spectra of the Elements": l'élève, puis le collaborateur de Rutherford, a mené les expériences de cet article dans son propre laboratoire. Le scientifique britannique cherche à y mesurer les spectres de rayons X en plaçant les éléments dans des tubes sous vide puis en les bombardant d'électrons. Grâce à ce dispositif, il mettra en évidence la loi de Moseley qui met en relation les longueurs d'onde des rayons X et le numéro atomique des éléments, concept qu'il découvre et nomme. Cet découverte permettra de compléter le tableau périodique de Mendeleïev de ses éléments encore non connus. Bel ensemble d'articles scientifiques novateurs dans leur édition originale. Exemplaire non coupé. Cachets de l'Institut catholique de Paris. Dos refait, un peu fragile. PMM, 407. DSB, Rutherford, Moseley.

London, Taylor & Francis, 1913. 8vo. Bound in one nice contemporary half calf binding with gilt leather title-label to spine. Published in "The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science", Vol. 26. No. 151-156 offered. Small repair to spine and blind stamped to lower part of title page. Front hindge a bit loose. A fine copy. The Bohr papers: pp. 1-25" pp. 476-502 pp. 857-875. [Moseley:] Pp. 1024-1034. [Entire volume: VIII, 1064 pp.+ 24 plates]. First edition of Bohr's seminal main work, which constitutes the departure from classical theories to the birth of modern atomic physics" by incorporating Planck's quantum postulate it became possible to calculate the wavelength of the hydrogen emission and thus to explain the regularity of the Balmer-lines. In 1922 Bohr was awarded the Nobel Prize "for his services in the investigation of the structure of atoms and of the radiation emanating from them"."Bohr's three-part paper postulated the existence of stationary states of an atomic system whose behavior could be described using classical mechanics, while the transition of the system from one stationary state to another would represent a non-classical process accompanied by emission or absorption of one quantum of homogeneous radiation, the frequency of which was related to its energy by Planck's equation" (Norman).In his previous paper ("On the Theory of Decrease of Velocity of Moving Electrified Particles on passing through Matter") Bohr had adopted Rutherford's nuclear model of the atom, and had become convinced that it was the peripherical electrons that determined the chemical properties of an element, whereas the nucleus determine the radioactive properties. However, Rutherford's model had an apparent explanatory problem: Why were the negatively charged electrons held away from the positive nucleus? In his doctorial dissertation on the electron theory of metals, Bohr had clarified the limitations of this theory, in particular its ability to explain magnetic properties, and he had shown how this arose from the classical nature of some of its foundations. Bohr strongly expected that the key to solving this problem was to be found in some way of introducing Planck's law of quantum action.In the beginning of 1913 Bohr heard about Rydberg's remarkable discovery in spectroscopy. Rydberg's formula could represent the frequencies of the lines of the hydrogen spectrum in the simplest form in terms of two integers. As soon as Bohr saw this formula, he immediately recognized that it gave him the missing clue to the correct way to introduce Planck's law of quantum of action into the description of the atomic systems. The rest of the academic year was spent reconstructing the whole theory upon the new foundation and expounding it in a large treatise, which was immediately published as these three papers in the 'Philosophical Magazine'. It was in these papers that Bohr first gave his postulates of the orbital structure of the electrons and their quantized radiation.Bohr's atomic theory inaugurated two of the most adventurous decades in the history of science. Bohr introduced the following postulates: 1. An electron can revolve about its nucleus only in certain special circular orbits. 2. The ordinary electron revolves about its nucleus in an invariable orbit, without radiating or absorbing energy. 3. Radiation takes place when and only when the electron falls from an orbit with greater energy to one of less energy."In his great papers of 1913, Bohr presented his theory as being founded upon two postulates, whose formulation he refined in later papers. The first postulate enunciates the existence of stationary states of an atomic system, the behavior of which may be described in terms of classical mechanics" the second postulate states that the transition of the system from one stationary state to another is a nonclassical process, accompanied by the emission or absorption of one quantum of homogeneous radiation, whose frequency is connected with its energy by Planck's equation. As for the principle by which the possible stationary states are selected, Bohr was still very far from a general formulation" indeed, he was keenly aware of the necessity of extending the investigation to configurations other than the simple ones to which he had restricted himself. The search for sufficiently general quantum conditions defining the stationary states of atomic systems was going to be a major problem in the following period of development of the theory." (DSB).Also contained in the volume is Henry Moseley's famous paper "The High-Frequency Spectra of the Elements" in which he "used the method of X-ray spectroscopy devised by Braggs to calculate variations in the wave length of the rays emitted by each element. These he was able to arrange in a series according to the nuclear charge of each element. [.] It was now possible to base the periodic table on a firm foundation, and to state with confidence that the number of elements up to uranium is limited to 92." (PMM 407).PMM 411Rosenfeld, Bohr Bibliography No. 6.