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arXiv physics/0005079physics.atom-phnlin.CD
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强场中原子的经典双电离

Classical double ionization of atoms in strong fields

Bruno Eckhardt, Krzysztof Sacha

摘要:

最近的高分辨率测量的动量从氩原子发射的两个电子在强激光场显示出强烈的偏好,出射的电子具有类似的动量,并在相同的方向上沿场喷射。我们讨论了这个过程的最后阶段,在一个经典的模型中的精神Wanniers方法的双电离后,电子碰撞。从一个高但负能量的中间态开始,场打开了一个通道,两个电子都可以通过这个通道逃逸。在这个过程的阈值附近,库仑排斥有利于电子动量和位置关于电场轴对称的逃逸。在这个对称子空间内的经典轨迹模拟占所观察到的动量分布的大部分功能。

英文摘要:

Recent high resolution measurements of the momenta of two electrons emitted from Argon atoms in a strong laser field show a strong preference for the outgoing electrons to have similar momenta and to be ejected in the same direction along the field. We discuss the final stages of this process in a classical model in the spirit of Wanniers approach to double ionization after electron impact. Starting from an intermediate state of high but negative energy the field opens up a channel through which both electrons can escape. Near the threshold for this process Coulomb repulsion favors an escape with the electron momenta and positions symmetric with respect to the electric field axis. Classical trajectory simulations within this symmetry subspace account for most features of the observed momentum distribution.

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