Quantum Theory Radiation Structure Atom by Bohr Niels (5 results)

(22 x 14,5 cm). VIII, 824 S. Mit Abbildungen und 18 teils gefalteten Tafeln. Halbleinwandband der Zeit. Erste Ausgabe. - Bohr beschreibt hier die Kathodenstrahlexperimente von Franck und Hertz mit Hilfe seiner Theorie, besonders den Übergang vom Normalzustand des Atoms in einen anderen stationären Zustand. "Die berühmten Stoßexperimente von Franck und Hertz wurden von Bohr sofort als Bestätigung der Existenz diskreter Energieniveaus aufgefaßt" (Röseberg, Bohr). - Stempel auf Titel. Einband gering berieben, sonst sauber und gut erhalten. - DSB 2, 239; Röseberg, Bohr Nr. 16 und 17. - Der Band enthält weiter Arbeiten von J. J. Thomson, Rayleigh, Bragg, Rutherford, Soddy etc.

Soft cover. Condition: Good. Niels BOHR, "On the Quantum Theory of Radiation and the Structure of the Atom", in the Philosophical Review, London, Taylor and Francis, sixth series, September 1915, pp321-418 with the Bohr on pp 394-415 This is offered without wrappers, extracted from a larger bound volume.

In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. Series 6 Vol. 30 = July-December 1915, No. 177, pp. 394-415; No. 178, pp. 581-612. Bound in half leather with gilt-stamped title on spine. Edges rubbed and spine slightly torn. Library stamps from Wilhelm von Siemens on title page and endpaper. Edges, endpaper, title page and some plate margins are brown-spotted. Poggendorff V, 139. - The complete Volume includes 18 plates, VII, 824 pp.- In this Volume are also included the following First Editions of: THOMSON, J.J., Conduction of Electricity through Metals. No. 175, pp. 192-202. Poggendorff V, 1254; THOMSON, J.J., The Mobility of Negative Ions at Low Pressures. No. 177, pp. 321-328; THOMSON, J.J., A Method of Finding the Coefficients of Absorption of the Different Constituents of a Beam of Heterogeneous Röntgen Rays, or the Periods and Coefficients of Damping of a Vibrating Dynamical System. No. 180, pp. 780-783. RUTHERFORD, E., J. BARNES and H. RICHARDSON, Maximum Frequency of the X Rays from a Coolidge Tube for Different Voltages. No. 177, pp. 339-360; RUTHERFORRD, E. and J. BARNES, Efficiency of Production of X Rays from a Coolidge Tube. No. 177, pp. 361-367. Poggendorff V, 1083. RICHARDSON, O.W., Metallic Conduction. No. 176, pp. 295-299. Poggendorff V, 1046. Sprache: Englisch.

Original binding. Condition: Very Good. First edition. FIRST EDITION, OFFPRINT, of Bohr's 1915 paper identifying conclusive experimental evidence for his model of the atom. "The central assumption [in the Bohr model] that 'stationary electron orbits' exist in atoms (and molecules) received justification in the crucial experiments of James Frank (1882-1964) and Gustav Hertz (1878-1975) in Berlin" although at the time the authors misinterpreted their results. They noted that "electrons in mercury vapor undergo elastic collisions with the molecules until they obtain a critical velocity, [and this] velocity is equivalent to the one obtained by electrons that have gone through a potential of 4.9 volts. "Though the authors claimed until 1916 that the 4.9 V represented the ionization potential of mercury, [in the paper being offered] Bohr argued rather: 'It seems that their experiments may possibly be consistent with the assumption that this voltage corresponds only to the transition from the normal state to some stationary state of the neutral atom' [On the Quantum Theory of Radiation and the Structure of the Atom, 410-11]. Hence he considered the Frank-Hertz experiment to give strong support to his atomic theory, and the experimentalists finally agreed with him. A decade later they received the Nobel Prize for physics 'for their discovery of the law governing the impact of an electron upon an atom' and in particular for their verification of Bohr's hypothesis of stationary states and the frequency condition" (Brown, Pais, et al. Twentieth Century Physics). With ownership signature on front wrapper of Harold S. King. King was a chemist who studied and worked at Harvard and later taught at Dalhousie University, Nova Scotia. He was the son of E.S. King, a noted Harvard astronomer. Offprint from: The Philosophical Magazine, vol xxx, September 1915, pp. 394-415. London: Taylor and Francis, 1915. Octavo, original wrappers; custom cloth box. Extremely fragile wrappers with wear to spine with wrappers barely holding; text fine.

London, Taylor & Francis, 1915. Contemp. hcalf. Spine gilt, title- and tomelabels with gilt lettering. Spine a bit rubbed, some cracking to hinges, but covers not detached. In: "The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science", Vol. XXX, Sixth Series. VIII,824 pp., textillustr. and 18 plates. (Entire volume offered). Bohr's papers: pp. 394-413 and pp. 581-612. A stamp to verso of titlepage. Internally clean and fine. First appearance of a landmark paper in which Bohr found experimental support for his energy equation for electron orbits and of stationary states in the work of Franck and Hertz from 1914. Furthermore, Franck and Hertz unwittingly provided an independent confirmation of the concept of stationary state. In 1914 they observed an energy threshold in the electron-stopping power of mercury vapor. This threshold, Bohr explained the following year, corresponded to a transition between the normal state and another (first excited) stationary state of the mercury atom (and not, as Franck and Hertz had originally thought, to the ionization of the atom). The supramechanical stability implied by the assumption of stationary states was now empirically proved to comprehend stability with regard to electron impacts."Bohr had to frequently revise and refine his atomic model in light of new discoveries. One significant paper "On the Quantum Theory of Radiation and the Structure of the Atom," (the paper offered) added more specific details about atomic states. For example Bohr had earlier made the argument that electrons could jump from one orbit to another as energy was emitted or absorbed. In this paper, he theorezed that an atom possesses stationary states in which energy was neither emitted nor absorbed. Any emission or absorption that did occur, such as might induce an electron ump, would correspond to the transition between two stationary states."(sparknotes.com).An: the second paper offered. When Bohr had finished his importent paper on the hydrogen atom "On the Theory of Decrease of Velocity of Moving Electrified Particles on passing through Matter" 1913, he completed another paper on that subject (the paper offered), which includes the influence of effects due to relativity and to straggling (that is, the fluctuations in energy and in range of individual particles).(Pais p. 128).Rosenfeld no 13 a. 14.The volume contains further importent papers by J.J. THOMSON, W.H. BRAGG, RUTHERFORD & BARNES, SODDY & HITCHINS etc.