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论文类型：期刊论文

发表时间：2009-01-01

发表刊物：Chinese Physics Letters

收录刊物：ISTIC、Scopus

卷号：26

期号：12

ISSN号：0256307X

摘要：The molecular dynamics (MD) method is used to simulate the interactions of energetic C20 clusters with the dense plasma targets within the framework of the linear Vlasov-Poisson theory. The influences of various clusters (H2, N2, C20 and C60 respectively) on stopping power are discussed. The simulation results show that the vicinage effects in the Coulomb explosion dynamics and the stopping power are strongly affected by the variations in the cluster speed and the plasma parameters. Coulomb explosions are found to proceed faster for higher speeds, lower plasma densities and higher electron temperatures. In addition, the cluster stopping power is strongly enhanced in the early stages of Coulomb explosions due to the vicinage effect, but this enhancement eventually diminishes, after the cluster constituent ions are sufficiently separated. For the large and heavy clusters, the stopping power ratio reaches much higher values in the early stage of Coulomb explosion owing to the constructive interferences in the vicinage effect. ? 2009 Chinese Physical Society and IOP Publishing Ltd.