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Example text

As we see in,figure 3, the peak,at Wo + wa is far from antisymmetric, belng mostly of one slgn. Drain [3] has discussed the form of the singularities in g(w) and its derivatives which one gets for the powder pattern of various first order quadrupolar interactions. P. SLiCHTER 52 wo+wa. w- Fig. 3. Derivative signal, dg(w)/d(w), for the dashed absorption curve of figure 2. With poor signal to noise, only the positive peak at w ~ Wc + wa is seen. Next easiest to see is the negative peak near Wo + wc' The flat, slightly negative signal between peaks is frequently hard to distin~~ish from the baseline.

Thus, the lattice always finds the spin-system described by a temperature in the rotating frame. We consider that there are three basic relaxation equations for the classical magnetizations Mx and Mz and for the expectation value of the dipolar energy <~>, which we write down phenomenologically. They are aM /at z (M o - M ) /T z a where T and Tb and T are relaxation times corresponding to exchang~ of energy with the lattice, and where <~>t is the value of <~> when the spin temperature is equal to the lattice.

What is remarkable is that the degree of order of the spin system is just the same when M = as when M = Mi' for, although it is clear that a system with net magnetization is ordered, it is not clear how there can be order when M = 0. The answer to this paradox is that even when H = 0, spins still experience magnetic fields owing to the presence of their neighbours. A typical spin will point either with or against the local field. For a highly ordered system, there will be a substantial excess pointing with the local field rather than against it.

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