Dynamics of the Coulomb explosion of large clusters in a strong laser field
Dynamics of the Coulomb explosion of large clusters in a strong laser field
复制标题
DOI：
10.1103/physreva.62.013201
复制
发表时间：
2000-06
影响因子：
2.9
通讯作者：
J. Jortner
中科院分区：
文献类型：
--
作者：
J. Jortner
使用经典动力学模拟研究强激光场中 ${\mathrm{Xe}}_{55}、$ ${\mathrm{Xe}}_{249}、$ ${\mathrm{Xe}}_{531}、$ 和 ${\mathrm{Xe}}_{1061}$ 簇的多电子电离和库仑爆炸，该模拟描述了未束缚电子和离子的运动。未结合电子的产生被描述为通过静电势垒抑制或碰撞电离从其主体原子（离子）中去除结合电子。根据激光功率 ${10}^{16}{\mathrm{W}/\mathrm{c}\mathrm{m}}^{2}$ 和频率 0.386 ${\mathrm{fs}}^{\mathrm{\ensuremath{-}}1}$ 的模拟结果，几乎所有未束缚的电子都从团簇中去除。在大型 ${\mathrm{Xe}}_{531}$ 和 ${\mathrm{Xe}}_{1061}$ 团簇中，电子主要在库仑爆炸导致团簇尺寸增大时被移除。准共振能量增强被证明是从团簇中去除电子的主要原因。能量增强过程受到电子-电子和电子-离子碰撞的阻碍。
The multielectron ionization and Coulomb explosion of ${\mathrm{Xe}}_{55},$ ${\mathrm{Xe}}_{249},$ ${\mathrm{Xe}}_{531},$ and ${\mathrm{Xe}}_{1061}$ clusters in a strong laser field is studied using classical dynamics simulations, which describe the motion of unbound electrons and ions. The generation of the unbound electrons is described as the removal of bound electrons from their host atoms (ions) by the electrostatic barrier suppression or collisional ionization. According to the results of simulations performed for the laser power ${10}^{16}{\mathrm{W}/\mathrm{c}\mathrm{m}}^{2}$ and frequency 0.386 ${\mathrm{fs}}^{\mathrm{\ensuremath{-}}1}$, almost all unbound electrons are removed from the clusters. In large ${\mathrm{Xe}}_{531}$ and ${\mathrm{Xe}}_{1061}$ clusters, electrons are removed mainly when the size of the clusters is enlarged due to Coulomb explosion. The quasiresonance energy enhancement is shown to be mainly responsible for the removal of electrons from the clusters. The energy enhancement process is hampered by electron-electron and electron-ion collisions.