Evidence for subpicosecond thermal spikes in the formation of tetrahedral amorphous carbon

被引:154
作者
Marks, NA
机构
[1] Australian Nuclear Science and Technology Organisation, Menai
来源
PHYSICAL REVIEW B | 1997年 / 56卷 / 05期
关键词
D O I
10.1103/PhysRevB.56.2441
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The molecular-dynamics technique involving the rapid cooling of a liquid to simulate an amorphous solid has been used for several years. Despite the success of the technique, the method has lacked a physical justification, and the cooling rates have been assumed to be too fast. In this paper an analysis of thermal spike cooling times in tetrahedral amorphous carbon shows that the method is reasonable and that rapid cooling rates are appropriate. Using three independent methods it is found that the thermal spike cools in less than a picosecond, considerably faster than previously recognized. An algorithm suitable for estimating cooling times in materials other than tetrahedral amorphous carbon is also presented.
引用
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页码:2441 / 2446
页数:6
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