COULOMBIC FISSION AND EVAPORATION OF ANTIMONY CLUSTER IONS

被引:37
|
作者
BRECHIGNAC, C
CAHUZAC, P
CARLIER, F
DEFRUTOS, M
LEYGNIER, J
ROUX, JP
机构
[1] Laboratoire Aimé Cotton, CNRS Bat. 505, Campus Orsay
来源
JOURNAL OF CHEMICAL PHYSICS | 1995年 / 102卷 / 02期
关键词
D O I
10.1063/1.469189
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The preferential dissociation channels of singly and doubly charged antimony clusters have been determined from the unimolecular dissociation of energy rich cluster ions, using an ion stopping technique. It is found that singly charged Sbn+ clusters with 5≤n≤80 dissociate by loss of neutral molecules. Neutral dimer loss is observed for n=5, 6, 7 whereas for n≥8, Sbn+ loses Sb4. The fragmentation of doubly charged Sbn++ has been investigated above the critical size nc++=24 from which doubly charged clusters are detectable in mass spectra. On the time scale of the experiment, which is 1 μs<t<100 μs with respect to photoionization, the delayed Coulombic fission into two singly charged clusters competes with the evaporation of Sb4. It is shown that for the smaller Sb n++ clusters with 26≤n≤36 the fission to two singly charged clusters is of relatively asymmetrical character, leading to the detachment of five and seven atom cationic fragments. In larger clusters n>40 the fission is of more symmetrical character and the difference in the fission products is less than 30%. Such a behavior totally deviates from the drop model predictions. © 1995 American Institute of Physics.
引用
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页码:763 / 769
页数:7
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