NANOSCALE SHOCK-WAVE GENERATION BY PHOTODISSOCIATION OF IMPURITIES IN SOLIDS - A MOLECULAR-DYNAMICS STUDY

被引:29
作者
BORRMANN, A [1 ]
MARTENS, CC [1 ]
机构
[1] UNIV CALIF IRVINE,IRVINE RES UNIT ADV COMP,IRVINE,CA 92717
关键词
D O I
10.1063/1.468756
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The dynamics of shock wave generation, propagation, and decay in an Ar lattice following photodissociation of an I2 impurity are studied using molecular dynamics simulation. A two-dimensional model is treated to allow the modeling of shock wave propagation over larger distances than easily accessible in full three-dimensional calculations. The shock waves are created on atomic length scales by binary collisions between the nascent photofragments and adjacent lattice atoms, and propagate long distances through the crystal in a highly directed, quasi-one-dimensional manner. As a consequence of the I/Ar mass ratio, the I fragments undergo multiple collisions with the adjacent Ar atoms situated along the I-I bond axis, generating pulse trains of shock waves, each with a characteristic initial energy, velocity, and decay rate. The dynamics of the system are interpreted using a simple one-dimensional hard sphere model. © 1995 American Institute of Physics.
引用
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页码:1905 / 1916
页数:12
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