Highly doubly excited states of the helium atom and the effects of nearresonant driving

氦原子的高度双激发态和近共振驱动的影响

• 批准号: 58386392
• 负责人: Dr. Javier Madronero
• 金额: --
• 依托单位: Universidad del Valle
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/58386392?language=en
• 关键词: Highly; doubly; excited; states; helium

Despite the seeming simplicity of the problem of three charged particles with known interactions, we are still far from having a comprehensive knowledge of the general structure of the energy spectrum and of the complete breakup of two-electron atoms. The aim of this project is to advance our understanding of the regime highly doubly excited states and their interaction with light. We focus our attention on the signatures of the underlying classical mixed regular-chaotic dynamics that are expected to become observable in the spectrum close to the break-up-threshold of two-electron atoms, and on the electronic correlations that manifest under the action of an electromagnetic field, e.g., in two-photon ionization processes, or in the formation of two-electron nondispersive wave packets. The understanding of this issues defines, however, a formidable theoretical and numerical challenge which is faced with the help of sophisticated approaches. These combine appropriate representations of the atomic Hamiltonian with large scale numerical calculations.

尽管具有已知相互作用的三个带电粒子的问题看似简单，但我们仍然远未全面了解能谱的一般结构和双电子原子的完全分裂。该项目的目的是增进我们对高度双激发态及其与光相互作用的理解。我们将注意力集中在潜在的经典混合规则混沌动力学的特征上，这些特征预计将在接近双电子原子破裂阈值的光谱中观察到，以及在电磁场，例如在双光子电离过程中，或在双电子非色散波包的形成中。然而，对这个问题的理解定义了在复杂方法的帮助下面临的巨大的理论和数值挑战。这些将原子哈密顿量的适当表示与大规模数值计算结合起来。