Abstract
The millimeter- and submillimeter-wave spectra of PtCO in the ground and ν 2 excited vibrational states were observed by employing a source-modulated microwave spectrometer. The PtCO molecule was generated in a free space cell by the sputtering reaction from a platinum sheet lining the inner surface of a stainless steel cathode using a dc glow plasma of CO and Ar. From the molecular constants determined for the ν 2 excited state, especially the l-type doubling constant, its harmonic wavenumber was determined to be ≈420 cm −1, which resolved the reported discrepancy between the previous matrix-infrared and theoretical estimates.
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