Paramagnetism spin magnetic moment

HC1 or HBr in the presence of the desired cation.164 [WOX4] are also known.164 These are all paramagnetic with magnetic moments close to the spin-only value, presumably because tetragonal distortion destroys the spin-orbit coupling.143 Their electronic spectra have been interpreted.164 165... 

A development in the theory of nuclear relaxation in macromolecules by paramagnetic ions has been suggested by Gueron. (675) In the case of heme proteins there is a net polarization of the iron electronic spin magnetic moment which is oriented along the direction of the magnetic field. Modulation of this dipolar field due to the spin polarization (Curie spin) by rotational diffusion introduces an additional term into the expression for transverse relaxation [equation (18)] giving ... 

If it is assumed that only the spin magnetic moment contributes towards mejy of a magnetically concentrated substances, then DE, the energy of spin interaction of paramagnetic ion is given by... 

For ordinary paramagnetic substances the integrated area under an ESR spectrum is proportional to the number of spins in the paramagnetic species producing the resonance line. In a multicomponent line the number of hyperfine components provides the magnitude of the nuclear spin. The g factor is a measure of the orbital contribution to the spin magnetic moment, and it is frequently possible to identify a particular valence state of an ion by its g factor. In chromia-alumina the valence states of Cr + and Cr + have been detected by ESR. 

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