Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (10): 883-889.doi: 10.3866/PKU.WHXB19991005

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Formation,Photodissociation and Structures of Si,Sn,Pb/P Binary Atomic Cluster lons

Liu Jian-Bo, Han Chun-Ying, Zeng Rong, Gao Zhen, Zhu Qi-He   

  1. State Key Laboratory of Molecular Reaction Dynamics,Institute of Chemistry,Beijing 100080
  • Received:1999-01-05 Revised:1999-02-24 Published:1999-10-15
  • Contact: Gao Zhen


 The formation and photodissociation of group Ⅳ(Si,Ge,Sn,Pb)/P binary cluster ions ,produced by laser ablation, were studied with a tandem TOF mass spectrometer. The stability of these cluster ions is influenced by their electronic and geometric structures ,and the geometric stability becomes more important for heavier group Ⅳ/P cluster ions. Two types of binary clusters marked with the magic numbers were observed: one type of magic clusters may be explained by the Wade's rule, in which P atom either attaches as electron-donating ligand to the closo-skeleton of group Ⅳatoms, or joins the closo-skeleton directly; another type of magic clusters are isoelectronic with magic species of neutral group Ⅳclusters or P clusters. The possible structures of magic cluster ions were studied by ab initio calculation and the Wade's rule.

Key words: Binary atomic clusters, Laser ablstion, Laser photodissociation, TOF mass spectrometer, Wades rule