Rotation in Solid Mixtures of Neohexane and Cyclopentane from 20°K to Their Melting Points

Studies of the broadening of the proton spin resonance line have been made for solid solutions of neohexane and cyclopentane.A convenient apparatus for control of temperatures from 10°K to room temperature for such studies is described.The ``complex'' of one mole of neohexane with two moles of cyclopentane rotates in the solid state down to 65°K. In solid solutions with cyclopentane in excess of the complex, the complex rotates independently of the cyclopentane down to 66°K. The complex has no effect on the lower rotational transition of the cyclopentane which apparently nucleates.