56 POINT DEFECT MOVEMENT AND ANNEALING IN .. 2431 and Au,and the results in the diamond-structured Si.we The research was supported by the U.S.Department of En- attributed the difference in damage production in the two ergy,Basic Energy Sciences under Grant No.DEFG02- kinds of solids to be due to the nature of bonding. 91ER45439,and by the Academy of Finland and University of Helsinki.Grants of computer time from the National En- ACKNOWLEDGMENTS ergy Research Computer Center at Livermore,California,the National Center for Supercomputing Applications,and the We are thankful to Dr.T.Diaz de la Rubia and Dr.M. Materials Research Laboratory at the University of Illinois at Ghaly for useful discussions during the course of this work. Urbana-Champaign are gratefully acknowledged. 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Alexander,N.W.Cheung,B.Park,and W.Skorupa,MRS Sym- 22M.P.Allen and D.J.Tildesley,Computer Simulation of Liquids posia Proceedings No.438 (Materials Research Society,Pitts- (Oxford University Press,Oxford,England,1989). burgh,in press). 23K.Nordlund,Comput.Mater.Sci.3,448 (1995). 45F.H.Stillinger and T.A.Weber,Phys.Rev.B 31,5262(1985). 24In practice,the final defect distributions were somewhat distorted 46O.W.Holland,J.Narayan,and D.Fathy,Nucl.Instrum.Methods from the ideal Gaussian shape due to the use of the 10 A mini- Phys.Res.B7/8,243(1985) mum distance criterion. 47G.Bai and M.-A.Nicolet,J.Appl.Phys.70,649 (1991).and Au, and the results in the diamond-structured Si, we attributed the difference in damage production in the two kinds of solids to be due to the nature of bonding. ACKNOWLEDGMENTS We are thankful to Dr. T. Dı´az de la Rubia and Dr. M. Ghaly for useful discussions during the course of this work. 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