Abstract
A newly developed optical hole-burning technique gives direct access to the nuclear spin conversion rate between the methyl group tunneling levels in the solid state and allows a comparison between the tunneling splitting in different electronic states. Using low temperature techniques spin conversion in dimethyl-s-tetrazine doped single crystals of durene could be followed for over more than 106 s. The relaxation data show below 4 K a transition from an Orbach to a Raman type temperature law as has been predicted by theory.
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