Quantum Rotational Tunneling of Methyl Groups in Polymers

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Abstract
Quantum rotational tunneling of methyl groups has directly been observed for the first time in polymers by high resolution inelastic neutron scattering. The experimental results are readily explained and reproduced quantitatively, without any adjustable parameter, by considering the distribution of tunneling lines which is obtained from the distribution of energy barriers for classical hopping of methyl groups at high temperature.