Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong.
J Chem Phys. 2013 Nov 21;139(19):194303. doi: 10.1063/1.4829767.
The laser induced fluorescence spectrum of palladium dimer (Pd2) in the visible region between 480 and 700 nm has been observed and analyzed. The gas-phase Pd2 molecule was produced by laser ablation of palladium metal rod. Eleven vibrational bands were observed and assigned to the 17.1Πg-X(3)Σu(+) transition system. The bond length (ro) and vibrational frequency (ΔG1∕2) of the ground X(3)Σu(+) state were determined to be 2.47(4) Å 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 Pd2.
已观察到并分析了钯二聚体（Pd2）在 480nm 至 700nm 可见光区域的激光诱导荧光光谱。气相 Pd2 分子是通过激光烧蚀钯金属棒产生的。观察到并分配到17.1Πg-X(3)Σu(+)跃迁系统的十一个振动带。基态 X(3)Σu(+)态的键长（ro）和振动频率（ΔG1∕2）分别确定为 2.47(4)Å和 211.4(5)cm(-1)。分子轨道能级图用于理解观察到的基态和激发态电子。这是对 Pd2 电子跃迁的首次气相实验研究。
