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Measurements of the proton spin-lattice relaxation time, T 1  , in polycrystalline NH 4 ReO 4  have shown that mechanical sample rotation in the static magnetic field reduces T 1  for proton magnetic resonance frequencies within the range 30 - 42 MHz. The rotation induced proton spin-lattice relaxation times, T 1  ′ , were measured at different Larmor frequencies, sample rotation frequencies, and temperatures. At room temperature T 1  ′  increases with increasing proton Larmor frequency. The dependence of T 1  ′  on sample rotation frequency and temperature is small. The "normal" proton T 1  times were determined as a function of temperature at 30 and 42 MHz. From these measurements an average activation energy of 2.4 kcal/mole was obtained for the NH 4  +  reorientation. The "normal" spin-lattice relaxation behavior was observed to be non-exponential at 30 MHz above 200 K and at 42 MHz above 260 K and is nearly independent on temperature above 300 K.

Investigation of the 1 H Spin-Lattice Relaxation in Polycrystalline NH 4 ReO 4 Induced by Mechanical Sample Rotation