XXth century_physics

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Arthur Holly Compton (1892-1962) Compton’s vector diagram for the scattering of a light quantum on a free electron [Phys.Rev. 24, 483 (1923)]
Compton’s Compton s long way to discovery [as summarized by Roger Stuewer (Ann. Ann.Phys Phys. 9, , 975 (2000)] In 1917 he unsuccessfully tried to find a dependence of magnetic field on X rays scattering from a magnetite crystal Then he came across Barkla’s paper who measured mass-absorption coefficient of X rays in aluminum µ/ρ = 0.153 cm 2 /g But the mass-absorption coefficient µ/ρ is the sum of massfluorescent coefficient τ/ρ and the mass-scattering coefficient σ/ρ From Thomson’s classical theory of scattering σ/ρ = 0.188 cm 2 /g for aluminum. In this theory the wavelength of radiation does not change after scattering Compton concluded that X rays must be diffracted by electrons. To explain measured values for λ = 10 –9 cm he had to assume that the electron is a very thin shell of electricity with radius of 2•10 –10 cm ”an electron as big as a baloon !” - Rutherford
Page 1 and 2:
Physics of the XX th century Part 1
Page 3 and 4:
Physics of the atom and the path to
Page 5 and 6: Hantaro Nagaoka Nagaoka's atomic mo
Page 7 and 8: Robert Millikan (1868-1953 (1868 19
Page 9 and 10: Charles Glover Barkla (1877-1944) d
Page 11 and 12: John William Nicholson (1911): atom
Page 13 and 14: Accelerated electric charge radiate
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
Page 30 and 31: ”The wavelengths of the first fou
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
Page 40 and 41: Periodic system of elements accordi
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 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 66 and 67: Clinton Davisson and Lester Germer
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
Page 76 and 77: ”In this communication I wish fir
Page 78 and 79: The uncertainty principle
Page 80 and 81: ”I used to take long walks on Sun
Page 82 and 83: ”The fact that the variables used
Page 84 and 85: ”A recent paper by the author may
Page 86 and 87: "It thus appears that we must aband
Page 88: Solvay Conference 1930
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