Abstract
Measurements of the rotating frame proton spin relaxation timeT1p in hexagonal ice single crystals as a function of temperature ϑ for various rotating magnetic field strengths reveal the expectedT1p minimum at the lowest practicable field values. This allows a very precise determination of the proton correlation (≜ molecular jump) time τc and the related activation energy ΔE by means of the theoretical reasoning of relaxation spectroscopy. We find the Arrhenius-law temperature dependenceτc=1.99×10−17exp(0.603/8.61×10−5 ϑ)sec, which is in good agreement with our earlier indirect derivation.
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