Study of the tunneling rotations in phase II of solid CH4 with high resolution neutron spectroscopy

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Abstract
High resolution incoherent neutron scattering experiments were performed to study in detail the temperature dependence and shape of the tunneling spectrum of pure and oxygen-doped CH4 in phase II. The tunnel splittings increase with decreasing temperature below 5 K, in qualitative agreement with a theoretical prediction of Yamamoto et al. A finite linewidth of the tunneling lines of several μeV was observed and is explained by inhomogeneous broadening due to the mixture of nuclear spin symmetry species. A qualitative comparison between the theoretical predictions and the experimental results is presented.