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Article Dans Une Revue Journal of Chemical Physics Année : 2010

Two-step melting of Na41+

Sébastien Zamith
Pierre Labastie
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Fabien Chirot
Jean-Marc L'Hermite

Résumé

The heat capacity of the mass selected Na41+ cluster has been measured using a differential nanocalorimetry method. A two-peak structure appears in the heat capacity curve of Na41+, whereas Schmidt and co-workers [ M. Schmidt, J. Donges, Th. Hippler, and H. Haberland, Phys. Rev. Lett. 90, 103401 (2003) ] observed, within their experimental accuracy, a smooth caloric curve. They concluded from the absence of any structure that there is a second order melting transition in Na41+ with no particular feature such as premelting. The observed difference with the latter results is attributed to the better accuracy of our method owing to its differential character. The two structures in the heat capacity are ascribed to melting and premelting of Na41+. The peak at lower temperature is likely due to an anti-Mackay to Mackay solid-solid transition.
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Dates et versions

hal-00527088 , version 1 (18-10-2010)

Identifiants

Citer

Sébastien Zamith, Pierre Labastie, Fabien Chirot, Jean-Marc L'Hermite. Two-step melting of Na41+. Journal of Chemical Physics, 2010, 133 (15), pp.154501. ⟨10.1063/1.3493375⟩. ⟨hal-00527088⟩
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