The mm-wave rotational spectrum of dichlorodimethylgermane

The rotational spectra of three isotopologues of dichlorodimethylgermane were measured by free jet absorption millimeterwave spectroscopy. A partial r0 structure was obtained. The barrier to internal rotation of the methyl groups is too high to cause splittings observable within our spectral resolution. Corresponding to the resolving power of the experiment, the lower limit to the V3 barrier is about 5.8 kJ/mol.