Is Rotational Tunneling Still Alive ? Questions concerning solid Methane and related

Orateur : Werner PRESS (Physics, University of Kiel, Germany)

After introducing some basics on rotational tunneling of small Molecules, the "State of the Art" is briefly reviewed. Apparently there is a host of high-resolution neutron data on solid methane, but also many open questions. Often reduced symmetry represents a severe obstacle. Within certain limits, this can be dealt with by use of the Pocket-state formalism and Hamiltonian matrices. Specific examples studied are (1) the tunneling density of states in A-methane (O2 doped CH4 at about 100 mK), (2) disorder of spherical top molecules and (3) rotational tunneling of the asymmetric top molecule CH2D2 (in monolayers on MgO 100 surfaces).

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