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Unformatted text preview: 5.61 Physical Chemistry 23-Electron Spin page 1 ELECTRON SPIN Experimental evidence for electron spin Compton Scattering (1921): AH Compton suggested that “the electron is probably the ultimate magnetic particle.” Stern-Gerlach Experiment (1922): Passed a beam of silver atoms (4d 10 5s 1 ) through an inhomogeneous magnetic field and observed that they split into two beams of space quantized components. Uhlenbeck and Goudsmit (1925) showed that these were two angular momentum states – the electron has intrinsic angular momentum – "SPIN" angular momentum Pauli Exclusion Principle (1925): no more than 2 electrons per orbital, or, no two electrons with all the same quantum numbers. Additional quantum number, now called m s , was postulated. Postulate 6: All electronic wavefunctions must be antisymmetric under the exchange of any two electrons. Theoretical Justification Dirac (1928) developed relativistic quantum theory & derived electron spin angular momentum Orbital Angular Momentum...
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This note was uploaded on 09/24/2011 for the course MATH 1090 taught by Professor Greenwood during the Spring '08 term at MIT.
- Spring '08