Hot and solid gallium clusters: too small to melt.
Phys Rev Lett
; 91(21): 215508, 2003 Nov 21.
Article
em En
| MEDLINE
| ID: mdl-14683319
ABSTRACT
A novel multicollision induced dissociation scheme is employed to determine the energy content for mass-selected gallium cluster ions as a function of their temperature. Measurements were performed for Ga(+)(n) (n=17 39, and 40) over a 90-720 K temperature range. For Ga+39 and Ga+40 a broad maximum in the heat capacity-a signature of a melting transition for a small cluster-occurs at around 550 K. Thus small gallium clusters melt at substantially above the 302.9 K melting point of bulk gallium, in conflict with expectations that they will remain liquid to below 150 K. No melting transition is observed for Ga+17.
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En
Ano de publicação:
2003
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Article