XXth century_physics
XXth century_physics XXth century_physics
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
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Compton’s Compton s long way to discovery<br />
[as summarized by Roger Stuewer (Ann. Ann.Phys Phys. 9, , 975 (2000)]<br />
In 1917 he unsuccessfully tried to find a dependence of magnetic<br />
field on X rays scattering from a magnetite crystal<br />
Then he came across Barkla’s paper who measured mass-absorption<br />
coefficient of X rays in aluminum µ/ρ = 0.153 cm 2 /g<br />
But the mass-absorption coefficient µ/ρ is the sum of massfluorescent<br />
coefficient τ/ρ and the mass-scattering coefficient σ/ρ<br />
From Thomson’s classical theory of scattering σ/ρ = 0.188 cm 2 /g for<br />
aluminum. In this theory the wavelength of radiation does not change<br />
after scattering<br />
Compton concluded that X rays must be diffracted by electrons. To<br />
explain measured values for λ = 10 –9 cm he had to assume that the<br />
electron is a very thin shell of electricity with radius of 2•10 –10 cm<br />
”an electron as big as a baloon !” - Rutherford
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