M. Prager, H. Grimm, S. Parker
Mar 1, 2000
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Journal
Physica B-condensed Matter
Abstract
Abstract Trimethylaluminum is composed of dimers linked via bridging methyl groups. Neutron spectroscopy is used to determine internal and external modes, especially rotational tunnelling. Librations of methyl groups are assigned on the basis of the isotope effect. Rotational potentials are derived. The bridging CH 3 group shows the strongest potential: Steric hindrance by the five-fold coordination of its C atom overcompensates the barrier reduction by the elongated Al–C bond.