Nonclassical double-bridged structure in silicon-containing molecules: Experimental evidence in Si_{2}H_{2} from its submillimeter-wave spectrum

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Abstract
The first spectroscopic evidence of a double-bridged silicon molecule is reported. The submillimeter-wave rotational spectrum of the disilyne Si2 H2 has been observed in a low-power silane plasma cooled at liquid-nitrogen temperature, with argon as buffer gas. These measurements led to the determination of the r0 structure, which is in good agreement with ab initio calculations. This nonclassical structure is confirmed by the observation of the Si29 and Si30 monosubstituted forms.