Pure Coulomb explosions of highly charged methane clusters investigated by a simple electrostatic model
Pure Coulomb explosions of highly charged methane clusters investigated by a simple electrostatic model
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通过简单的静电模型研究高电荷甲烷簇的纯库仑爆炸
DOI：
10.1088/0953-4075/41/10/105601
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发表时间：
2008-05-28
影响因子：
1.6
通讯作者：
Xu, Zhizhan
中科院分区：
文献类型：
--
作者：
Chen, Guanglong;Wang, Cheng;Xu, Zhizhan
本文用简化的静电模型研究了甲烷团簇（CA（4））（n）（轻原子A = H或D）的纯库仑爆炸。分析了爆炸产生的离子能量与团簇大小和碳离子电荷状态的关系。研究发现，与质子的平均能量随碳离子的电荷q的增加而增加不同，氘的平均能量在q大于4时趋于饱和。这意味着当激光强度足够高以使（CD 4）（n）电离到（C4+D4+）（n）的电荷状态时，来自氘代甲烷团簇（CD 4）（n）的台式激光驱动库仑爆炸的中子产额可以通过增加相互作用体积而不是通过增加激光强度以产生更高的电荷状态（C6+D4+）（n）来显著增加。研究了碳离子和轻离子的飞行时间谱。
The pure Coulomb explosions of the methane clusters (CA(4))(n), (light atom A = H or D) have been investigated by a simplified electrostatic model for both a single cluster and an ensemble of clusters with a given cluster size distribution. The dependence of the energy of ions produced from the explosions on cluster size and the charge state of the carbon ions has been analysed. It is found that, unlike the average proton energy which increases with the charge q of the carbon ions, the average deuteron energy tends to saturate as q becomes larger than 4. This implies that when the laser intensity is sufficiently high for the (CD4)(n) to be ionized to a charge state of (C4+D4+)(n), the neutron yield from a table-top laser-driven Coulomb explosion of deuterated methane clusters (CD4)(n) could be increased significantly by increasing the interaction volume rather than by increasing the laser intensity to produce the higher charge state (C6+D4+)(n). The flight-time spectra of the carbon ions and the light ions have also been studied.