Abstract
The stable molecular unit of trimethylaluminium is thedimer linked via bridging methyl groups. Neutronspectroscopy is used to determine internal and external modes fromµeV (rotational tunnelling transitions of methyl groups,stochastic rotational jumps) to meV (deformations, librations,phonons etc). The dimer appears to be non-rigid with a very softbend mode about an axis connecting the two bridging methyl groups.Rotational potentials are derived from tunnelling modes and barrierheights deduced from quasielastic spectra. Internal modes obtainedfrom ab initio calculations for the isolated dimer areconsistent with measured vibrations with respect to eigenenergiesand band intensities calculated by the CLIMAX program. The bridgingCH3 group shows the strongest and almost purely intramolecularpotential due to a loss of a single bond axis of itspentacoordinated carbon atom.
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