Experimental Determination of the Melting Point and Heat Capacity for a Free Cluster of 139 Sodium Atoms

Autor:	Bernd von Issendorff, Martin Schmidt, Werner Kronmüller, Hellmut Haberland, Robert Kusche
Rok vydání:	1997
Předmět:	Phase transition Materials science chemistry Sodium Enthalpy of fusion Melting point Mass spectrum Cluster (physics) Finite system General Physics and Astronomy chemistry.chemical_element Thermodynamics Heat capacity
Zdroj:	Physical Review Letters. 79:99-102
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.79.99
Popis:	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 ${\mathrm{Na}}_{N}^{+}$, with $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}139$, 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%.
Databáze:	OpenAIRE
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