quantum postulate atomic theory nature de bohr niels (3 resultados)

Hardcover. Condición: Very Good. Bohr, Niels. "The Quantum Postulate and the Recent Development of Atomic Theory" in "Nature", Macmillan & Co, London, 1928, vol. 121, pp. 580-590, offered in the full volume of 1044, lxiipp, covering January-June, complete. Bound in a very sturdy cloth. Very nice, clean copy. VG  "Complementarity was not an arbitrary creation of Bohr s mind, but the precise expression, won after patient efforts demanding a tremendous concentration, of a state of affairs entirely grounded in nature s laws, one that, according to Bohr s familiar exhortation, had to be learned only from nature. It consecrated the recognition of a statistical from of causality as the only possible link between phenomena presenting quantal individuality, but made it plain that the statistical mode of description of quantum mechanics was perfectly adapted to these phenomena and gave an exhaustive account of all their observable aspects. From the epistemological point of view, the discovery of the new type of logical relationship that complementarity represents is a major advance that radically changes our whole view of the role and meaning of science. In contrast with the nineteenth-century ideal of a description of the phenomena from which every reference to their observation would be eliminated, we now have the much wider and truer prospect of an account of the phenomena in which due regard is paid to the conditions under which they can actually be observed thereby securing the full objectivity of the description, since the description is based on purely physical operations intelligible and verifiable by all observers. The role of the classical concepts in this description is obviously essential, since those concepts are the only ones adapted to our capabilities of observation and unambiguous communication."--Complete DSB online. [++] Also appearing in this volume are three Nobel Prize-producing papers by Raman (with K. S. Krishnan), on pp 501-2; "A Change of Wave-length in Light Scattering" on p. 619; and with Krishnan again, "The Optical Analogue of the Compton Effect", p. 711. ("Raman and K. S. Krishnan then undertook to isolate the effect under impeccable experimental conditions. They employed complementary light filters placed in the paths of the incident and scattered light, respectively, and observed a new type of secondary radiation from the scattering of focused beams of sunlight in both carefully purified liquid and dust-free air. They reported this discovery in a letter to Nature in February 1928. Raman then refined the experiment by using a mercury arc as the source of light; the effect was thus clearly seen for the first time on 28 February 1928 and was reported to the Science Congress at Bangalore the following month."--Complete DSB online.

Soft cover. Condición: Good. 1st Edition. First edition, journal issue in original wrappers, of this fundamental paper introducing Bohr's statement of his complementarity principle, the basis of what became known as the Copenhagen interpretation of quantum mechanics. "From the epistemological point of view, the discovery of the new type of logical relationship that complementarity represents is a major advance that radically changes our whole view of the role and meaning of science. In contrast with the nineteenth-century ideal of a description of the phenomena from which every reference to their observation would be eliminated, we have the much wider and truer prospect of an account of the phenomena in which due regard is paid to the conditions under which they can actually be observed - thereby securing the full objectivity of the description" (DSB). The concept of complementarity started to develop in Bohr's mind during discussions with Heisenberg in Copenhagen early in 1927, when Heisenberg was preparing for publication his famous paper on the uncertainty principle. In fact, the published version of Heisenberg's paper contains a note added in proof which mentions 'recent investigations by Bohr [that] have led to points of view that permit an essential deepening and refinement of the analysis of the quantum mechanical relationship attempted in this work'. "Bohr presented his ideas on complementarity for the first time at an international congress of physics in Como in the fall of 1927, commemorating the centenary of Volta's death. On this occasion, he stressed that in the quantum world, contrary to the classical world, an observation of a system can never be made without disturbing the system. But how can we then know the state of the system? The quantum postulate would seem to imply that the classical distinction between the observer and the observed was no longer tenable. How then would it be possible to obtain objective knowledge? Bohr's reflections on these and related questions led him to introduce the notion of complementarity as denoting the use of complementary but mutually exclusive viewpoints in the description of nature. Two years later, he defined the complementarity principle as 'a new mode of description . . . in the sense that any given application of classical concepts precludes the simultaneous use of other classical concepts which in a different connection are equally necessary for the elucidation of phenomena' . . . The wave description and the particle description are complementary and thus in conflict. But Bohr argued that the physicist is still able to account unambiguously for his experiments, for it is he who chooses what to measure and thereby destroys the possibility of the realization of the conflicting aspect . . . The complementarity principle became the cornerstone of what was later referred to as the Copenhagen interpretation of quantum mechanics. Pauli even stated that quantum mechanics might be called 'complementarity theory', in an analogy with 'relativity theory'. And Peierls later claimed that when you refer to the Copenhagen interpretation of the mechanics what you really mean is quantum mechanics . . . by the mid-1930s Bohr had been remarkably successful in establishing the Copenhagen view as the dominant philosophy of quantum mechanics" (Kragh, Quantum Generation (1999), pp. 209-210). This paper was published essentially simultaneously in English and German, and somewhat later in Danish and French. Large 8vo, pp. cxiii-cxvi, 561-578, iv, 579-590, v-viii, 591-608, cxvii-cxx. Original printed wrappers (light vertical crease, one advertisement leaf (vii/viii) with an advertisement cut out).

Condición: Very Good. First Edition. First edition of Niels Bohr's paper, "The Quantum Postulate and Atomic Theory," as published in Nature, vol. 121, no. 3050, pp. 561-608, April 14, 1928, the entire issue offered here, with Bohr's paper on pp. 580-590. Some soiling to covers, light creasing, ink stamp on front cover, a very good copy. Pages 581-588 are loose from binding. Rare in the original wrappers.