XXth century_physics
XXth century_physics XXth century_physics
Clinton Davisson and Lester Germer Electron diffraction observed by reflection from nickel crystals (1927)
”The investigation reported in this paper was begun as the result of an accident which occured in this laboratory in April 1925. At that time we were continuing an investigation, first reported in 1921 [Davisson & Kunsman, Science 64, 522 (1921)], of the distribution-in-angle of electrons scattered by a target of ordinary (polycrystalline) nickel. During the course of this work a liquid-air bottle exploded at a time when the target was at a high temperature; the experimental tube was broken, and the target heavily oxidized by the inrushing air. The oxide was eventually reduced and a layer of the target removed by vaporization, but only after prolonged heating at various temperatures in hydrogen and vacuum. When the experiments were continued it was found that the distribution-in-angle of the scattered electrons had been completely changed... We must admit that the results obtained in these experiments have proved to be quite at variance with our expectations.” C. Davisson & L. H. Germer, Phys.Rev. 30, 705 (1927)
- Page 15 and 16: Attenuation of radiation for rings
- Page 17 and 18: Solvay Conference 1913
- Page 19 and 20: H. Geiger - On the Scattering of th
- Page 21: Proc. Roy. Soc. 82, 495 (1909)
- Page 24 and 25: In the ”plum-pudding” model of
- Page 26 and 27: "Consider an atom which contains a
- Page 28 and 29: ”...considering the enormous vari
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- Page 32 and 33: Spectral lines were seen as manifes
- Page 34 and 35: In the Bohr’s model spectral line
- Page 36 and 37: Bohr found excellent description of
- Page 38 and 39: Periodic system of elements accordi
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- Page 42 and 43: Intra-atomic Charge ”Now, accordi
- Page 44 and 45: H. G. J. Moseley, Phil. Mag. 26, 10
- Page 46 and 47: ”We have here a proof that there
- Page 48 and 49: James Franck Gustav Hertz Franck-He
- Page 50 and 51: James Franck Gustav Hertz ”...it
- Page 52 and 53: Wojciech (Adalbert) Rubinowicz (188
- Page 54 and 55: Solvay Conference 1921
- Page 56 and 57: Arthur Holly Compton (1892-1962) Co
- Page 58 and 59: Compton’s data [(Phys. Rev.19, 26
- Page 60 and 61: Compton effect
- Page 62 and 63: The crisis of the quantum theory
- Page 64 and 65: Louis de Broglie
- Page 68 and 69: George P. Thomson Electron diffract
- Page 70 and 71: Important dates in the development
- Page 72 and 73: Heisenberg to Pauli (July 9, 1925)
- Page 74 and 75: ”It is well known that the formal
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- Page 82 and 83: ”The fact that the variables used
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Clinton Davisson<br />
and<br />
Lester Germer<br />
Electron diffraction observed<br />
by reflection from nickel crystals (1927)