Energy distributions of ions emitted from argon clusters Coulomb-exploded by intense femtosecond laser pulses
Energy distributions of ions emitted from argon clusters Coulomb-exploded by intense femtosecond laser pulses
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DOI：
10.1103/physreva.69.063201
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发表时间：
2004-06
影响因子：
2.9
通讯作者：
M. Hirokane;S. Shimizu;M. Hashida;S. Okada;S. Okihara;F. Sato;T. Iida;S. Sakabe
中科院分区：
文献类型：
--
作者：
M. Hirokane;S. Shimizu;M. Hashida;S. Okada;S. Okihara;F. Sato;T. Iida;S. Sakabe
实验研究了氩原子团簇（最多12800个原子/团簇）在飞秒强激光作用下发生库仑爆炸后所产生的离子的能量分布。在2 × 10 {sup 16} W/cm{sup 2}的激光强度下，能量大于15 keV的离子呈各向异性发射，能量小于15 keV的离子呈各向同性发射。产生了电荷态高达Ar{sup 14+}的氩离子，其高电荷态比势垒抑制电离模型预期的要多。Ar{sup 8+}-Ar{sup 14+}离子的产额和最大能量与激光偏振方向有关，而Ar{sup +}-Ar{sup 7+}离子的产额和最大能量对激光偏振方向不太敏感。结果表明，强激光光场电离产生的电子碰撞电离产生高电荷态各向异性发射离子。
Energy distributions of ions emitted from argon clusters (up to 12 800 atoms/cluster) Coulomb-exploded with an intense femtosecond laser have been experimentally studied. Under the laser intensity of 2x10{sup 16} W/cm{sup 2}, the ions of >15 keV are anisotropically emitted, while those lower than 15 keV tend to be isotropic. The argon ions of charge state up to Ar{sup 14+} were generated, and their high charge state is more than expected by the barrier suppression ionization model. The yield and maximum energy of Ar{sup 8+}-Ar{sup 14+} ions depend on laser polarization direction, while those of Ar{sup +}-Ar{sup 7+} are much less sensitive to the laser polarization. The present results suggests that high-charge-state and anisotropically emitted ions are produced by impact ionization of electrons that are produced by optical field ionization with the intense laser.