Hot and solid gallium clusters: Too small to melt

被引：203

作者：

Breaux, GA ^{[1
]}

Benirschke, RC ^{[1
]}

Sugai, T ^{[1
]}

Kinnear, BS ^{[1
]}

Jarrold, MF ^{[1
]}

机构：

[1] Indiana Univ, Dept Chem, Bloomington, IN 47405 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 21期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.91.215508

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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(+).

引用

页码：1 / 215508

页数：4

共 45 条

[1] Heating of Al13- and Al14 clusters -: art. no. 193410 [J].