Mechanisms of infrared-laser-assisted atomic ionization by attosecond pulses
Mechanisms of infrared-laser-assisted atomic ionization by attosecond pulses
复制标题
阿秒脉冲红外激光辅助原子电离机制
DOI：
10.1103/physreva.81.021404
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发表时间：
2010
影响因子：
2.9
通讯作者：
and N. Toshima
中科院分区：
文献类型：
--
作者：
X. M. Tong;P. Ranitovic;C. L. Cocke;and N. Toshima
提出了一种理解红外激光阿秒脉冲辅助原子电离的机制。红外激光场中的原子结构可以用Floquit态来描述，单个AP可以通过不同的Floquit态将原子电离到Floquet态。通过不同Floquite分量的电离干扰导致了电离产额作为AP到达时间的函数的振荡。提出的机制解释了最近的实验观察[Johnsson，Phys.莱特牧师。99,233001(2007年)]。此外，我们发现，对于特定的光电子能量，对于He和Ar原子，电离产额总是作为AP和IR激光之间的相对相位的函数而振荡。
We propose a mechanism to understand the infrared (IR) laser assisted atomic ionization by attosecond pulses (AP). Atomic structures in an IR laser field are described by Floquet states and atoms can be ionized to a Floquet state by a single AP through different Floquet components. The interference of ionization through different Floquet components results in the oscillation of the ionization yield as a function of the arriving time of the AP. The proposed mechanism explains the recent experimental observations [Johnsson , Phys. Rev. Lett. 99, 233001 (2007)]. Furthermore, we find that, for a specified photoelectron energy, the ionization yield always oscillates as a function of the relative phase between the AP and the IR laser for both He and Ar atoms.