Evolution of Bloch vectors and other quantities obtained from tomographed density matrices

5 EVOLUTION OF BLOCH VECTORS AND OTHER QUANTITIES OBTAINED FROM TOMOGRAPHED DENSITY MATRICES 

To illustrate the Bloch sphere representation of an NMR system, let us consider the density matrix of an ensemble of spins 1/2 nuclei. Because the high temperature deviation density matrix is proportional to 1, the effect of an RF pulse is to induce rotations that transform the initial density matrix into a linear combination of the spin operator components, 

the evolution of such density matrix is contained in the coefficients i(r), which represent the component of the vector I(r) = Notice that 

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Evolution of Bloch vectors and other quantities obtained from tomographed density matrices... 

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