Electronic transitions of palladium dimer

摘要

The laser induced fluorescence spectrum of palladium dimer (Pd_2) in the visible region between 480 and 700 nm has been observed and analyzed. The gas-phase Pd_2 molecule was produced by laser ablation of palladium metal rod. Eleven vibrational bands were observed and assigned to the [17.1]Πg3-XΣu+3 transition system. The bond length (r_o) and vibrational frequency (ΔG_(1/2)) of the ground XΣu+3 state were determined to be 2.47(4) ? and 211.4(5) cm~(-1), respectively. A molecular orbital energy level diagram was used to understand the observed ground and excited electronic states. This is the first gas-phase experimental investigation of the electronic transitions of Pd_2.