Microwave spectroscopy of AgCCH and AuCCH in the states

The rotational spectra of AgCCH and AuCCH were measured using Fourier-transform microwave (FTMW) and source-modulated millimeter-wave spectrometers. For the FTMW measurements, AgCCH and AuCCH were generated in supersonic jets using the pulse-discharge reaction of laser-ablated metal atoms with HCCH diluted with Ar. For the millimeter-wave measurements, these molecules were generated in a free-space cell by sputtering of metal sheets. Rotational transitions were measured for 107AgCCH, 109AgCCH, 107AgCCD, 109AgCCD, AuCCH, and AuCCD. The r 0 structures of both molecules were obtained from the rotational constants. The quadrupole parameters of the Au and D nuclei were compared with those of other metal monoacetylides.