Selenium silver clusters

In the case of selenium-bridged copper clusters, it was found that there is a structural transition from molecular spherical structures towards cutouts of the bulk structure when the clusters reach 70 copper atoms. An analogous structural transformation has not yet been found in the case of sulfur-bridged silver clusters. For etample, the dication [Ag7oS2o(SPh)28(dppm)2o] in 94 shows a sheD-like sulfur substructure that consists of an inner Sg and an outer S40 polyhedron (Figure 3.73). 

Selenium-Bridged Silver Clusters The reaction chemistry of Ag(I) and... 

Zeolite channels have provided sites for silver [555, 556], silicon [557], and selenium [558, 559] clusters copper clusters have been generated between the layers of montmorillonite [560] and copper, platinum, and palladium clusters were formed in silicon dioxide matrices [561]. 

In their LDI-MS investigation of ZnO and ZnSe deposits, Kukreja et al. demonstrated the critical importance of laser fluence on the resulting LDI mass spectra due to changes in the plume composition and ion cluster distribution [52]. In the positive-ion-generating mode and at a laser fluence of 100 J/m the LDI mass spectrum of a polycrystalline commercial sample of ZnSe consisted only of signals due to series of clusters of silver (an impurity), selenium, and silver-selenium species. At a laser fluence of 700 J/m the mass spectrum was domi-... 

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