Energy quantization in double ioinization in strong laser fields

强激光场中双电离的能量量子化

• 批准号: 235637746
• 负责人: Professor Dr. Reinhard Dörner
• 金额: --
• 依托单位: Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/235637746?language=en
• 关键词: Energy; quantization; double; ioinization; strong

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.

如今，飞秒激光器通常提供的强度可以使单个原子吸收许多光子，从而喷射一个或多个电子。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由光子能量间隔开的离散峰。对于两个电子的喷射，两个电子连续体中的离散能量结构是通过理论预测的，但迄今为止尚未通过实验观察到。该项目旨在提供这种缺失的实验证据。自 2011 年 10 月起，我们在法兰克福大学的实验室配备了新型独特的飞秒激光器（100 kHz，100 uJ，800 nm，45 fsec）以及专用的 COLTRIMS 反应显微镜。我们建议使用该设施首次展示强场双电离中两个电子连续体中能量的长期预测量子化。我们将解决与这一基本量子现象相关的许多悬而未决的问题，例如验证两个电子连续体中的有质动力位移、由偶数或奇数吸收的光子引起的两个电子连续体的偶数或奇数对称性的后果以及问题如果仅总能量或对于顺序电离，单个电子能量也被量子化。