Mass-selected photodissociation studies of AlPbn+ clusters (n=7-16): Evidence for the extraordinary stability of AlPb10+ and AlPb12+

被引:20
作者
Bhattacharyya, Soumen [1 ]
Thanh Tung Nguyen [1 ]
De Haeck, Jorg [1 ]
Hansen, Klavs [2 ]
Lievens, Peter [1 ]
Janssens, Ewald [1 ]
机构
[1] Katholieke Univ Leuven, Lab Solid State Phys & Magnetism, B-3001 Louvain, Belgium
[2] Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden
关键词
METAL-CLUSTERS; DISSOCIATION-ENERGIES; COPPER CLUSTERS; MPB12; CLUSTERS; CAGE CLUSTERS; EVAPORATION; PB-12(2-); PATHWAYS; IONS; PB;
D O I
10.1103/PhysRevB.87.054103
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report fragmentation pathways and dissociation energies of AlPbn+ (n = 7-16) clusters. The clusters are produced with pulsed laser vaporization and studied in a supersonic molecular beam setup. They are mass selected and photodissociated with 532 and 355 nm laser light. Photofragments are thereafter mass separated in a tandem reflectron time-of-flight mass spectrometer. Bare Pb-n(+) (n = 8-16) clusters preferentially evaporate Pb atoms, with the exception of Pb-15(+) that fragments by loss of a Pb-2 dimer to form the stable Pb-13(+) cluster. The smallest AlPbn+ (n = 7-11) clusters also show mainly atomic Pb evaporation, whereas the favored fragmentation pathway of the larger clusters (n = 12-16) involves Pb-2 and Pb-3 fragments. AlPb10+ and AlPb12+ are the most intense fragments of several larger cluster sizes, demonstrating the high stability of these two sizes. Dissociation energies corresponding to the most facile fragmentation channel of AlPbn+ (n = 11-15) are bracketed from the measured laser fluence dependencies of the fragment intensities using constraints imposed by unimolecular reaction rates. DOI: 10.1103/PhysRevB.87.054103
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页数:7
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