Lecture_5 - 8. Electron Spin and the Pauli Exclusion...

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8. Electron Spin and the Pauli Exclusion Principle S. Goudsmit Concept of e spin G. Uhlenbeck ¾ A spinning charged particle produces a magnetic moment. ¾ Spectra of some atoms and molecules could be interpreted only by introducing a 4 th quantum number, the “electron spin quantum number”, m s . ¾ The spin quantum number is responsible for the spinning of the electron about its own axis (not a fixed reference axis). ¾ Only two possible values of m s : +1/2 and 1/2 . an electron spinning clockwise would behave like a small magnet whose field vector points upwards . an electron spinning counterclockwise acts like a small magnet whose field vector points downwards . m s = 2 1 + m s = 2 1 ± Evidence for spin: experiment by Stern and Gerlach (1921) ¾ A beam of Ag atoms splits in two in a magnetic field, not due to orbital angular momentum. ¾ Only contribution to angular momentum is from 5s electron ( l = 0). ¾
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This note was uploaded on 09/07/2010 for the course FAS chem 201 taught by Professor Sultan during the Summer '07 term at American University of Beirut.

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Lecture_5 - 8. Electron Spin and the Pauli Exclusion...

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