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.

今天的飞秒激光器通常提供的强度可以使许多光子被单个原子吸收，从而导致一个或多个电子的喷射。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，其由光子能量间隔开。对于两个电子的喷射，在两个电子连续谱中的离散能量结构被理论预测，但迄今为止还没有被实验观察到。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中拥有了一台新的独特的飞秒激光器（100 kHz，800 nm处100 uJ，45 fsec）以及专用的COLTRIMS反应显微镜。我们建议使用这个设施，以显示第一次在强场双电离的两个电子连续的长期预测的能量量子化。我们将解决许多悬而未决的问题，连接到这个基本的量子现象，如验证的有质动力位移在两个电子连续，后果的偶数或奇数对称性的两个电子连续产生的偶数或奇数光子吸收和问题，如果只有总能量或顺序电离也单个电子能量被量化。