论文标题
由圆极化激光脉冲驱动的原子双电离的非绝热效应
Nonadiabatic effects in the double ionization of atoms driven by a circularly polarized laser pulse
论文作者
论文摘要
我们研究受圆极化（CP）激光脉冲的原子的双电离。我们分析了两个基本电离过程：在旋转框架（RF）的光中，顺序（SDI）和非顺序（NSDI）双电离自然地嵌入了CP脉冲中的非绝热效应。我们使用和比较两个绝热近似：实验室框架（LF）中的绝热近似值和RF中的绝热近似。 RF中的绝热近似封装在LF中发生的亚周期时间标准上电子的能量变化，并通过完全考虑离子电子相互作用来充分考虑。这使我们能够确定两个非绝热效应，包括降低阈值强度，在该阈值强度发生的阈值强度以及电子电离时间的降低。结果，这些非绝热效应促进了过度的电离电离和回忆引起的电离。我们分析了这些非绝热对回忆机制的结果。我们表明，激光包膜在NSDI中心的CP脉冲中的回旋通道中起了工具作用。
We study the double ionization of atoms subjected to circularly polarized (CP) laser pulses. We analyze two fundamental ionization processes: the sequential (SDI) and non-sequential (NSDI) double ionization in the light of the rotating frame (RF) which naturally embeds nonadiabatic effects in CP pulses. We use and compare two adiabatic approximations: The adiabatic approximation in the laboratory frame (LF) and the adiabatic approximation in the RF. The adiabatic approximation in the RF encapsulates the energy variations of the electrons on subcycle timescales happening in the LF and this, by fully taking into account the ion-electron interaction. This allows us to identify two nonadiabatic effects including the lowering of the threshold intensity at which over-the-barrier ionization happens and the lowering of the ionization time of the electrons. As a consequence, these nonadiabatic effects facilitate over-the-barrier ionization and recollision-induced ionizations. We analyze the outcomes of these nonadiabatic effects on the recollision mechanism. We show that the laser envelope plays an instrumental role in a recollision channel in CP pulses at the heart of NSDI.
