Abstract
The behavior of a set of particles in a rotating magnetic field is analyzed to determine how the lengthening of a nuclear magnetic resonance free- induction decay might occur. An experimert to determine the effect of pulse length on the subsequent free-induction decay was carried out for gypsum, calcium fluoride, and ice. A single r-f pulse at the Larmor frequency of the spin system was applied to the sample in equilibrium and the resulting free-induction decay shape was recorded. The r-f pulse length was varied from 1 to 18 mu sec and the magnetic field ranged from 3 to 30 gauss. (C.E.S.)
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