Dynamics simulation on the interaction of intense laser pulses with atomic clusters

Dynamics simulation on the interaction of intense laser pulses with atomic clusters
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强激光脉冲与原子团簇相互作用的动力学模拟

DOI:
10.1088/1674-1056/18/6/051
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发表时间:
2009-06
期刊:
影响因子:
1.7
通讯作者:
Du Hong-Chuan(杜洪川)等
Du Hong-Chuan(杜洪川)等
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Du Hong-Chuan(杜洪川)等

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在经典粒子动力学条件下,研究了强飞秒激光脉冲与二十面体稀有气体原子团的相互作用过程。计算结果表明,在离子、电子和激光的联合场中,电离主要是通过隧道电离进行的,而不是电子撞击电离。随着簇大小的增大,产物离子的平均动能和最大动能均增大。根据我们的计算,激光辐照后团簇的膨胀过程以库仑爆炸为主,膨胀尺度随着团簇尺寸的增大而增大。本文还讨论了产物离子的平均动能和平均电荷态与激光波长的关系。研究了平均动能与团簇内原子数的关系,并与实验数据进行了比较。计算结果与实验结果吻合较好。
Under classical particle dynamics, the interaction process between intense femtosecond laser pulses and icosahedral noble-gas atomic clusters was studied. Our calculated results show that ionization proceeds mainly through tunnel ionization in the combined fleld from ions, electrons and laser, rather than the electron-impact ionization. With increasing cluster size, the average and maximum kinetic energy of the product ion increases. According to our calculation, the expansion process of the clusters after laser irradiation is dominated by Coulomb explosion and the expansion scale increases with increasing cluster size. The dependence of average kinetic energy and average charge state of the product ions on laser wavelength is also presented and discussed. The dependence of average kinetic energy on the number of atoms inside the cluster was studied and compared with the experimental data. Our results agree with the experimental results reasonably well.
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