Abstract
Abstract 2D, 15N and 35Cl NMR measurements were performed on different monodomain crystals of trissarcosine calcium chloride (TSCC). The electric field gradient (efg) tensors at the deuterium and the chlorine sites in the hydrogen bonds are determined at room temperature by measuring the angular dependence of the spectra for rotations around the three crystallographic axes. The small splitting of the deuterium NMR line near the phase transition (Tc-T = 5 K) can be explained by a small variation of the orientation of the efg tensor for sarcosine molecules of type II. An ordering of the deuterons in the hydrogen bond could not be detected. This conclusion is consistent with previous nitrogen-15 NMR measurements which revealed a motion of the protons perpendicular to the hydrogen bridge. From the chlorine-35 NMR measurements a very low quadrupole frequency was derived which is in agreement with previous NQR results.
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