Photodissociation of lead/antimony bimetallic cluster cations

Abstract

Lead-antimony metal cluster cations are studied with laser photodissociation in a reflectron time-of-flight mass spectrometer system. Dissociation products resulting from excitation at 308 nm are compared to those found for pure lead or pure antimony cluster cations. All clusters studied exhibit extensive fragmentation, consistent with relatively weak intracluster metal-metal bonding. Prominent dissociation channels include the elimination of neutral or charged lead atoms and dimers and the formation of stable X S b 3 + cation species. There is little or no preference for the formation of cations which exist as magic numbers in the original cluster distribution.

Infrared resonance-enhanced multiphoton ionization spectroscopy of magnesium oxide clusters

“…It has been shown in previous MPI studies of other metal clusters that the prominent masses are essentially the same as those produced when the clusters grow directly as cations. 45 The more abundant clusters in the small size range can therefore be associated with stable cations. The infrared ionization process on the other hand is believed to occur as neutral clusters absorb energy gradually to heat the cluster.…”

A computational study of 13-atom Ar–Kr cluster heat capacities

“…It has helped provide much insight into the transition from finite to bulk behavior, since many of the physical properties of bulk systems are highly modified in clusters because of their much greater fraction of surface atoms. Although most studies have dealt with homogeneous clusters, heterogeneous clusters have been increasingly the subjects of both experimental [1][2][3][4][5][6][7][8] and theoretical [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] investigations. Most of these studies have concentrated on bimetallic clusters, in large part because of the roles they play in catalysis.…”

Electronic States of Al3P2, Al2P3, and Their Ions

“…Duncan and co-workers [19][20][21][22] have employed photoionization and photodissociation techniques to extract important information on the photofragmentation patterns and spectroscopic properties on the excited states of the cations of such clusters. At present, these techniques have been used to study mixed heavier cations such as In x Sb y + .…”

“…The group 13−15 clusters have been the topic of many studies − in recent years not only due to their intrinsic merit but also due to their technological importance, as group 13−15 materials find applications in high speed and high luminosity semiconductor devices and light-emitting diodes. Smaller clusters are intriguing in that they do not evolve smoothly as a function of their sizes to the bulk, as they exhibit dramatic variations in their properties, spectra and relative abundance.…”