Spin Dynamics and Radical Reactions


An electron possesses a spin of magnitude \( (\sqrt 3/2) \) ħ, just like a proton. Associated with this is a magnetic moment μ e that is conventionally written as
$$ {\mu_e}=-g\beta S $$
, where S is the operator for the electron spin. As the minus sign shows, μ e points in the opposite direction as the spin, owing to the negative charge of the electron. The strength of the magnetic moment, which is about 658 times that of a proton, is expressed in terms of the Bohr magneton β of the electron, β = 9.27 × 10−26 J/Gauss, and a number g. This so-called g-factor amounts to 2.0023 for a free electron. If the electron is confined in an organic molecule containing no transition elements, g is only slightly higher or lower, usually by much less than one percent. Its value is characteristic for its surroundings. (Actually, g is a tensor, but in liquid solution rapid molecular motions average out all anisotropy effects.)


Triplet State Radical Pair Spin Dynamics Hyperfine Coupling Constant Electron Spin Polarization 
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© Springer-Verlag Berlin Heidelberg 1995

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  • M. Goez

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