Abstract
The OH - substituted in KCl for a Cl - has six [001] equilibrium orientations. If the crystal is subjected to two-dimensional compression in the (001)-plane the two orientations [001] and [00 1 ] have the lowest energy. Therefore at low temperatures the hydroxyl dipole behaves like a particle in a double well. Measurements of the dielectric constant along [001] down to 0.025 K indicate that this system has a tunneling splitting Δ' < 0.025K k B and rather unusual relaxation properties.
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