Abstract
Due to the short space available this article introduces into the actual state of tunnelling spectroscopy mainly by referring to recent literature. The interested reader will find there the full information. Topics discussed in this paper are: separation of intra- and intermolecular contributions to the rotational potential, the calculation of tunnel splittings from transferable pair interaction potentials, the effect of pressure and isotopic substitution, tunnelling molecules as probes in matrices, on surfaces and in complex ions, the coupling of tunnel rotors to phonons, and the corresponding evolution of tunnelling transitions to a quasielastic spectrum with increasing temperature. Finally some recent works on spin conversion are presented.
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