By Webster A. G.

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The frequency associated with an ^ ^ absorptive acc single q u a n t u m t r a n s i t i o n is E m- i - E Transitions for w h i c h TIONS. _ M = \ΔΤΗ\ > 1} + M = 1 are called Β MULTIPLE QUANTUM T T h e s e transitions o c c u r t h r o u g h the absorption or emission of se- 28 1. ELEMENTARY ω0ι THEORY OF MAGNETIC RESONANCE - " o( l - 0 - \ Am < -I ε -w (m-i). 0 Am =-l -6J (l-l)0 ·ω0\ (b) (α) (c) F I G . 10. (a) E n e r g y levels of a n u c l e u s w i t h s p i n / in a u n i f o r m field; (b) a b s o r p t i v e single q u a n t u m t r a n s i t i o n ; (c) a b s o r p t i v e m u l t i p l e q u a n t u m t r a n s i t i o n .

F o r this particular case, the motion of T(t) is identical w i t h the motion sketched i n F i g . 9 except for a decay of T(t) through the t,T exponential factor e~ *. F o r times τ ^> Tx, T2 , the contribution of T(t) to the nuclear magnetization is negligible, so that experiments designed to detect the decay of T(t) must be performed over time intervals that are comparable to the relaxation times. Experiments of this nature are called transient experiments] they include pulsed nuclear resonance experiments and the so-called spin echo experiments (28, 26), w h i c h are especially useful for the determination of relaxation times.

10). and the phenomenon excites transitions between l e v e l s EM — T h e e x c h a n g e of a single q u a n t u m spin system is s a i d t o b e an ABSORPTIVE o r EMISSIVE SINGLE QUANTUM TRANSITION, o r ΔM = -f-l. The frequency associated with an ^ ^ absorptive acc single q u a n t u m t r a n s i t i o n is E m- i - E Transitions for w h i c h TIONS. _ M = \ΔΤΗ\ > 1} + M = 1 are called Β MULTIPLE QUANTUM T T h e s e transitions o c c u r t h r o u g h the absorption or emission of se- 28 1.

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