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Extra resources for Nuclear Ground-State Properties from Mean-Field Calculations
As we see in,figure 3, the peak,at Wo + wa is far from antisymmetric, belng mostly of one slgn. Drain  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.