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Formation, growth mechanism and packing sequences of binary alloy cluster anions from laser ablation of mixtures of lead and transition metals
Author(s) -
Zhang Xia,
Tang Zichao,
Gao Zhen
Publication year - 2003
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.956
Subject(s) - chemistry , icosahedral symmetry , transition metal , cluster (spacecraft) , crystallography , magic number (chemistry) , metal , binary number , coordination number , laser ablation , alloy , computational chemistry , electronic structure , laser , ion , arithmetic , mathematics , organic chemistry , physics , computer science , optics , programming language , catalysis , biochemistry
By using laser ablation of the mixtures of a transition metal (M: Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Pd, Ag) plus lead, M/Pb binary cluster anions were observed except for Zn, and the number of transition metal atoms contained in the binary clusters is at most 4. This behavior is different from that reported previously for M/Ge binary clusters. The experiments indicate that it is also very difficult to form Al/Pb clusters. The distribution patterns of M/Pb binary alloy cluster anions are remarkably similar to those of pure Pb clusters, consistent with a formation mechanism in which transition metal atoms are sequentially attached to [M x−1 Pb y ] − clusters and thus form [M x Pb y ] − clusters by a simple condensation process. As the number of transition metal atoms increases, the intensities of binary clusters gradually decrease. It is proposed that [MPb 4 ] − and [MPb 5 ] − cluster anions might be the unit building blocks of M/Pb binary cluster anions, and the layer packing sequences for magic clusters are predicted on this basis. The [M x Pb y ] − binary clusters containing 13 atoms (x + y = 13; x ≠ 0) are proposed to have an icosahedral structure. Copyright © 2003 John Wiley & Sons, Ltd.