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Evidence for subpicosecond thermal spikes in the formation of tetrahedral amorphous carbon N. A. Marks
 

Summary: Evidence for subpicosecond thermal spikes in the formation of tetrahedral amorphous carbon
N. A. Marks
Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia
Received 12 February 1997
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. S0163-1829 97 00830-8
I. INTRODUCTION
In recent times the simulation technique of rapidly cool-
ing a liquid to form an amorphous solid has increased in
popularity. This method, which will be referred to as the
liquid quench technique, has been successfully applied to
several materials including amorphous silicon,1,2
amorphous
carbon,35
and tetrahedral amorphous carbon.59

  

Source: Adler, Joan - Physics Department, Technion, Israel Institute of Technology

 

Collections: Physics