Energy quantization in double ioinization in strong laser fields

今天的飞秒激光通常会提供单个原子可以吸收多个光子的强度，从而导致一个或多个电子被抛出。对于单个电子的发射，光场能量的量子化导致发射电子的能谱中的离散峰值被光子能量隔开。对于双电子的抛射，理论上预言了双电子连续体中的离散能量结构，但到目前为止还没有在实验上观察到。本项目旨在提供这一缺失的实验证据。自2011年10月以来，我们在法兰克福大学的实验室拥有了一台新的独特的飞秒激光器(100 kHz，100 uJ，800 nm，45 fsec)，以及专用的COLTRIMS反应显微镜。我们建议利用这一装置首次显示在强场双电离中双电子连续谱中能量的长期量子化。我们将解决许多与这一基本量子现象相关的公开问题，例如验证双电子连续体中有质动力的移动，由吸收的偶数或奇数个光子引起的双电子连续体的偶数或奇数对称性的后果，以及是否仅对总能量或顺序电离也对单个电子能量进行量子化的问题。

Femtosecond lasers today routinely provide intensities at which many photons can be absorbed by a single atom leading to the ejection of one or more electrons. For emission of a single electron the quantization of the energy of the light field leads to discrete peaks in the energy spectrum of the emitted electron which are spaced by the photon energy. For ejection of two electrons discrete energy structures in the two electron continuum are predicted by theory but have not been observed experimentally so far. This projects aims to provide this missing experimental evi-dence. Since October 2011 we have a new unique femtosecond Laser (100 kHz, 100 uJ at 800 nm, 45 fsec) together with a dedicated COLTRIMS reaction microscope in our laboratory at Frankfurt University. We propose to use this facility to show for the first time the long predicted quantization of energy in the two electron continuum in strong field double ionization. We will address many open questions connected to this fundamental quantum phenomenon such as verification of the ponderomotive shift in the two electron continuum, consequences of the even or odd symmetry of the two electron continuum resulting from the even or odd number of photons absorbed and the question if only the sum energy or for sequential ionization also the individual electron energy is quantized.