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The rotational spectrum of SiH 3 -S-SiH 3  in its vib-torsional ground state has been investigated in the frequency range between 8 and 40 GHz. From the absolute frequencies and torsional splittings a rigid-top-rigid-frame r 0 -structure could be derived. The molecular electric dipole moment was determined from the second order Stark effect of some AA-species rotational transitions. The analysis of the microwave spectrum of the related molecule SiH 3 -O-SiH 3  was yet unsuccessful. However several features of the observed spectrum rend support to the idea of a “quasi-linear” double rotor molecule with a relatively low energy hump for the linear configuration of the Si-O-Si-chain.

Microwave Spectrum of (SiH 3 ) 2 X, X = O,S, r 0 -Structure, Molecular Electric Dipolemoment and Barrier to Internal Rotation of Disilylsulfide