EXPERIMENTAL-DETERMINATION OF THE MELTING-POINT AND HEAT-CAPACITY FORA FREE CLUSTER OF 139 SODIUM ATOMS

Authors
SCHMIDT M KUSCHE R KRONMULLER W VONISSENDORFF B HABERLAND H
Citation
M. Schmidt et al., EXPERIMENTAL-DETERMINATION OF THE MELTING-POINT AND HEAT-CAPACITY FORA FREE CLUSTER OF 139 SODIUM ATOMS, Physical review letters, 79(1), 1997, pp. 99-102
Citations number
27
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
79
Issue
1
Year of publication
1997
Pages
99 - 102
Database
ISI
SICI code
0031-9007(1997)79:1<99:EOTMAH>2.0.ZU;2-W
Abstract
The heat capacity of a free cluster has been determined from the tempe rature dependence of its photofragmentation mass spectrum. The data fo r the spherical sodium cluster Na-N(+) with N = 139, show a maximum at 267 K, which is interpreted as the solid-to-liquid phase transition i n 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%.