In the last chapter it was pointed out that one of the very serious drawbacks of the non-resonant method is that the parameter actually measured may not in general be simply related to the spin-lattice relaxation time T1 defined in Chapter I; it is more likely instead to be a weighted mean of the relaxation rates of all populated paramagnetic states. With the advent of spin resonance techniques, however, it became possible to measure the actual population difference between a selected pair of energy levels, and this opened up a way of determining the relaxation behaviour related to individual transitions.
KeywordsPower Level Spin System Relaxation Phenomenon Saturation Behaviour Saturation Factor
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