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Monomeric platinum cyanide, PtCN, was detected in the gas phase by employing a source-modulated microwave spectrometer. The PtCN radical was generated in a free space cell using the sputtering reaction from a platinum sheet placed on the inner surface of a stainless steel cathode through a dc glow plasma of CH 3 CN diluted with Ar. The rotational constants obtained for several isotopomers indicated that the monomeric platinum cyanide is in a cyanide form (PtCN) and not in an isocyanide form (PtNC). Observed fine- and hyperfine-spectral patterns suggest that the PtCN radical has the 2 Δ 5 / 2 electronic ground state.

The rotational transitions of AuH and AuD with the hyperfine structure due to the gold nucleus (I = 3/2) were observed in the 220, 430, and 650 GHz regions with source modulation microwave spectrometers. The AuH and AuD molecules were generated by sputtering from a gold sheet lining the inner surface of a stainless-steel cathode in a dc glow discharge through hydrogen and deuterium gases, respectively, diluted with argon gas. The nuclear electric quadrupole coupling constant and the nuclear magnetic spin-rotation coupling constant were determined for each isotopomer by a least-squares analysis.