物理化学学报 >> 2000, Vol. 16 >> Issue (07): 621-626.doi: 10.3866/PKU.WHXB20000709

研究论文 上一篇    下一篇

激光溅射下原子团簇生长的非平衡动力学

曹玉群, 黄荣彬, 郑兰荪   

  1. 固体表面物理化学国家重点实验室,厦门大学化学系,厦门 361005
  • 收稿日期:1999-11-03 修回日期:2000-01-27 发布日期:2000-07-15
  • 通讯作者: 郑兰荪 E-mail:lszheng@xmu.edu.cn

Non-equilibrium Kinetics of Clusters Growth under Laser Ablation(II)

Cao Yu-Qun, Huang Rong-Bin, Zheng Lan-Sun   

  1. State Key Laboratory for Physical Chemistry of Solid Surface,Department of Chemistry,Xiamen University,Xiamen 361005
  • Received:1999-11-03 Revised:2000-01-27 Published:2000-07-15
  • Contact: Zheng Lan-Sun E-mail:lszheng@xmu.edu.cn

摘要:

在“半球模型”(即假设激光溅射产生的等离子体向空间均匀膨胀)的基础上 ,在考虑了因等离子体膨胀和热辐射等引起的温度和体积的变化的情况下 ,进一步考虑了碳簇的链状、单环、双环、多环及富勒烯等五种结构及中性粒子与中性粒子、中性粒子与离子两种反应 ,计算了碳簇中性分子和离子的形成动力学及其尺寸分布. 计算结果表明离子的尺寸分布可以近似代表中性粒子的尺寸分布 ,动力学计算所模拟的碳簇的尺寸分布与实验记录的碳簇离子的质谱特征较为相似.

关键词: 原子团簇, 动力学, 激光溅射, 尺寸分布

Abstract:

Non-equilibrium kinetics of cluster formation has been simulated based on “hemisphere model”of laser plasma expansion. In this article, in addition to the variation of concentration and temperature caused by expansion and radiation, reactivities of different structures and structural conversions among the cluster isomers were also considered. Dissociation of the clusters in the laser plasma and productions of the cluster ions have also been included in the simulation at the first time. The simulated size distribution of carbon clusters is in good consistency with the typical mass spectrum of carbon cluster ions produced by laser ablation.

Key words: Clusters, Kinetics, Laser ablation, Size distribution