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Modern Physics
9 Feb 2012 10:07:41 IST
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16 May 2012 00:21:01 IST
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I am delighted to see this question. Electron Spin is intrinsic property of an electron with NO classical analog. All attempts including electron as spinning sphere are failed to explain what is spin correctly. For more information contact me on mihirdurve@rediffmail.com
16 May 2012 00:28:06 IST
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And by the way Intrinsic propery means electron will always have Total angular momentum = orbital angular momentum + Spin angular momentum. Now the cause of Spin angular momentum is still a question to us. Uhlenbeck and Goudsmit proposed to consider electron as spinning sphere but Ehrenfest showed that in this case the point on electron must have speed greater than speed of light !!! So that Idea was discarded and We take spin as "God" given mystery....
16 May 2012 21:54:23 IST
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the spin must be related to the field created by accelerating electron. as the probability of a electron at a place changes from time to time and so does the field present there. the symmetry between the probability and field through Schrodinger equation suggests us the the concept of "spin of electron".
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Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a technique for studying chemical species that have one or more unpaired electrons, such as organic and inorganic free radicals or inorganic complexes possessing a transition metal ion. The basic physical concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of spins of atomic nuclei. Because most stable molecules have all their electrons paired, the EPR technique is less widely used than NMR. However, this limitation to paramagnetic species also means that the EPR technique is one of great specificity, since ordinary chemical solvents and matrices do not give rise to EPR spectra.
EPR was first observed in Kazan State University by Soviet physicist Yevgeny Zavoisky in 1944, and was developed independently at the same time by Brebis Bleaney at the University of Oxford.