Abstract
Clusters of Ne n atoms (up to n = 90) formed in a supersonic nozzle expansion have been studied by electron impact ionization mass spectrometery. The Ne cluster mass spectra show the special stability of cluster ions with icosahedral structure ( n = 13 and 55) confirming - despite previous discrepancies - the general validity of the sphere-packing principle. Neon cluster ions exhibit other magic numbers, e.g. at n = 21 and 75, not common to all of the other rare gases.
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