Secondary ion mass spectrometry of metal halides. 2. Evidence for structure in alkali iodide clusters

Ab initiocalculations of structures and stabilities of(NaI)nNa+Aguado1, Ayuela2, López3 et al. 1998Phys. Rev. B4010590View full textAdd to dashboardCite

“…Large clusters of these materials were first produced by bombardment of crystalline targets with Xe ϩ ions and detected by means of secondaryion mass spectrometry. [1][2][3] The mass spectra showed anomalies in the cluster intensities for certain values of n, which were tentatively interpreted as revealing the enhanced stability of ''cuboidlike'' structures. The results were explained in terms of a direct emission model, which assumes that cuboidlike cluster ions are directly sputtered from the crystal.…”

Structure and bonding in small neutral alkali halide clusters

“…Energy difference between hexagonal and rocksalt isomers in (AX) 6 vs the ratio of ionic radii. The two isomers of (AX) 5 ͑a decagonal ring and a cube with an AX molecule attached to it͒ and the hexagonal isomers of (AX) 7 contain some low coordinated ions, in contrast to (AX) 6 . (AX) 9 is also more compact than the elongated forms of (AX) 10 and (AX) 8 .…”

Direct fission versus sequential evaporation mechanism of sputtered caesium iodide cluster ions

“…In addition to reviewing work [1,2,3], we draw attention to those instructive findings which in particular describe some of the general characteristics of these clusters, like for instance the magic number problem which was related to the cluster structures, the internal energy content, the evaporation behaviour and the cluster ion lifetime [8,9,10,11].…”

“…The spectrum for up to medium sized clusters (n<60) shows an exponential decay of abundances accompanied by certain anomalous ion intensities. The latter were mainly attributed to the variation in the stability of "cubic-like" and non-"cubic-like" geometries [8,9,10].…”