Table of Contents
Laser Chemistry
Volume 17, Issue 2, Pages 109-122
http://dx.doi.org/10.1155/1997/49504

Ion-Size Effects in the Growth Sequences of Metal-Ion-Doped Noble Gas Clusters

1Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, Crete, Heraklion 711 10, Greece
2Fachbereich Physik, Universität Rostock, Universitätsplatz 3, Rostock 18051, Germany
3Department of Physics, University of Crete, Heraklion 710 03, Greece

Received 13 October 1996

Copyright © 1997 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We have studied the stability and the structure of doped noble gas cluster ions of the type M+Xn, (M=In, Al, Na, X=Ar, Kr, Xe) by systematically changing the composition M/X and observing changes in the magic number patterns appearing in the mass spectra. When the metal ion radius is comparable to the radius of the noble gas atom, the mass spectra show the familar icosahedral magic numbers n+ 1=13,19,23,26,29,32, 46, 55,... In constrast, for metal ions with radii significantly smaller than the noble gas atoms, we observe a new series of magic numbers n + 9, 11, 17, 21,24, 26,... This series converts into the icosahedral one for larger clusters. Using a simple hard sphere packing model, we show that this new series of magic numbers is consistent with a cluster growth sequence which is based on a capped square antiprism (CSA) geometrical structure of the clusters.