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Über Wellen und Korpuskeln in der Quantenmechanik. Offprint presented to Kramers

1927réf. 460501927. Jordan Pascual 1902-80. Über Wellen und Korpuskeln in der Quantenmechanik. Offprint from Zeitschrift für Physik 45 1927. 766-775pp. 229 x 157 mm. Original printed wrappers slightly toned. Very good. Presentation Copy inscribed by Jordan to H. A. Kramers 1894-1952 on the front wrapper: "Kramers Mit vielen herzlichen Grüßen!" Kramers with best regards. First Edition Offprint Issue. Jordan the "unsung hero among the creators of quantum mechanics" Schweber QED and the Men who Made It p. 5 was one of the founders of quantum electrodynamics. In 1927 Dirac had laid out the initial formulation of QED in his paper "The quantum theory of emission and absorption of radiation" which introduced the idea of "second quantization" to reconcile the wave and light-quantum descriptions of the electromagnetic field. "Reading Dirac's QED paper gave Jordan the insight on how to 'second quantize' so that the quanta obeyed the Pauli exclusion principle" Schweber p. 34. For Jordan this second quantization "was to be viewed as the quantization of a classical field. Jordan had been very much drawn to the de Broglie-Einstein-Schrödinger view that fields were the primary entities. Moreover he believed that this procedure should be applied to matter fields in the same way as it had been applied by him to the electromagnetic field in his paper with Born 1926 and in the Dreimännerarbeit 1926 . . . In a series of seminal papers including this one stimulated by Dirac's formulation Jordan established that the 'second quantization' procedure could in fact be thus interpreted. These papers laid the foundation of quantum field theory" Schweber p. 33; emphasis ours. Following a joint paper with Oskar Klein "Zum Mehrkörperproblem der Quantentheorie" 1927 Jordan published the present paper in which he formulated the quantization rules to yield Fermi-Dirac statistics. This paper "contained several other formal and mathematical generalizations but its main practical value is that in the newly established theory of the 'quantized wave field' the fluctuations in the Bose case now satisfied all requirements following from Einstein's light-quantum treatment of 1924 and 1925" Mehra and Rechenberg Historical Development of Quantum Theory 6 p. 231. . unknown

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HEISENBERG, WERNER & MAX BORN & PASQUAL JORDAN & WOLFGANG PAULIBiblio.com

Über quantentheoretische Umdeutung kinematischer und mechanischer Beziehungen. Heisenberg. With: Zur Quantenmechanik. Born a. Jordan. With: Zur Quantenmechanik II. Born Heisenberg a. Jordan. With: Über das Wasserstoffspektrum vom Standpunkte de. - THE BIRTH OF QUANTUM MECHANICS

1925réf. 39170Berlin Julius Springer 1925-26. Bound in 4 nearly uniform contemp. hcloth. Edges a little rubbed. Stamp on title-pages. In "Zeitschrift für Physik. Hrsg. von Karl Scheel" Vols 333435 and 36. VII950;VII953;VIII954;VII951 pp. The offered papers: pp. 879-893 vol.33 pp. 858-888 vol.34 pp.557-615 vol.35 and pp.336-363 vol. 36. Internally fine and clean. First printings of these four absolutely fundamental papers which together MARK THE TURNING POINT IN THE FABRICATION OF A NEW PHYSICS Quantum Mechanics also called "Matrix Mechanics"."In May 1925 Heisenberg took on a new and difficult problem the calculation of the line intensities of the hydrogen spectrum. Just as he had done with Kramers and Bohr Heisenberg began with a Fourier analysis of the electron orbits. When the hydrogen orbit proved too difficult he turned to the anharmonic oscillator. With a new multiplication rule relating the amplitudes and frequencies of the Fourier components to observed quantities Heisenberg succeeded in quantizing the equations of motion for this system in close analogy with the classical equations of motion.in June Heisenberg returned to Göttingen where he drafted his fundamental paper the first paper offered which he completed in July. In this paper Heisenberg proclaimed that the quantum mechanics of atoms should contain only relations between experimentally observable quantities. The resulting formalism served as the starting point for the new quantum mechanics based as Heisenberg's multiplication rule implied on the manipulation of ordered sets of data forming a mathematical matrix.Born and his assistant Pascual Jordan quickly developed the mathematical content of Heisenberg's work into a consistent theory with the help of abstract matrix algebra the second paper offered.Their work in collaboration with Heisenberg culminated in their "three-man paper" "Dreimännerarbeit" - the third paper offered that served as the foundation of matrix mechanics. Confident of the correctness of the new theory Heisenberg Pauli Born Dirac and others began applying the difficult mathematical formalism to the solution of lingering problems." DSB.In the last paper offered the Pauli-paper he shows that the hydrogen spectrum can be derived from the new theory. His starting-point constitutes due to Lez a method for integrating the classical equations of motion of a particle in a Coulomb field. Pauli's paper was received on January 17 1926 but the main result must have been obtained before November 3 1925 for on that date Heisenberg writes Pauli: ".Ich brauche Ihnen wohl nicht zu schreiben wie sehr ich mich über die neue Theorie des Wasserstoffs freue." Pauli's paper convinced most physicists that Quantum Mechanics is correct. Van der Waerden. hardcover