Flourescence-dip submillimeter-wave spectroscopy of ionic and radical clusters

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In the supersonic jet expansions short-lived species can survive thanks to the collision-less environment and ultra low rotational as well as vibrational temperature. The fluorescence-dip, millimeter-wave spectrometer combined with supersonic jet nozzle and glow discharge electrodes, as well as the UV excimer laser photolysis devices, also have been set up for the detection of novel unstable species, such as radicals, molecular ions, and ionic and radical clusters.A millimeter-wave absorption spectrometer combined with pulsed-jet expansion technique has also been devised and applied to the direct observation of the rovibrational transitions of the vdW bending band of molecular clusters. We have applied this technique to observe the vdW bending bands of the ArHCN and ArDCN clusters as well as the ArHBr and OCO ' HF clusters. We have extended our measurements to the clusters as He ・HCN, Ne・HCN, H_2・HCN, and H_2・H_2O.To increase the detection sensitivity, we employed a White-type multi-reflection optical systems in the millimeter-wave region.