Abstract
We report on optically detected magnetic resonance experiments conducted at high pressures on an organic mixed crystal system. Changes in triplet state zero-field splittings (ZFS) of the guest molecule monitored as a function of host crystal compression reveal the existence of three compressional regimes. Up to 7 kbar most contraction is intermolecular with little change in intramolecular distances. From 7 to 25 kbar shrinkage of the lattice is proportional to the decrease in molecular volume. Above 25 kbar this linearity no longer holds, and the ZFS suggests a distortion in molecular geometry.
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