Phys. Rev. Lett. 79, 99–102 (1997)Experimental Determination of the Melting Point and Heat Capacity for a Free Cluster of 139 Sodium AtomsReceived 13 March 1997; published in the issue dated 7 July 1997 The heat capacity of a free cluster has been determined from the temperature dependence of its photofragmentation mass spectrum. The data for the spherical sodium cluster NaN+, with N = 139, show a maximum at 267 K, which is interpreted as the solid-to-liquid phase transition in this finite system. The melting point lies 104 K, or 28% lower than that of bulk sodium. The latent heat of fusion is reduced by 46%. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.99
DOI:
10.1103/PhysRevLett.79.99
PACS:
64.70.Dv, 36.40.Ei, 36.40.Qv
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