Unsubstituted silanethione, H(2)Si=S, has been characterized experimentally for the first time by means of rotational spectroscopy; the equilibrium structure of this fundamental molecule has been evaluated through a combination of experimental data from a total of ten isotopologues and results of high-level coupled-cluster calculations.

We have measured the reduced absorption coefficients occurring in the wings of the potassium 4 2 S-5 2 P doublet lines at 404.414 nm and at 404.720 nm broadened by

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