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

尽管已知相互作用的三个带电粒子的问题看起来很简单，但我们仍然远远没有全面了解能谱的一般结构和双电子原子的完全分裂。这个项目的目的是推进我们对高度双激发态及其与光的相互作用的理解。我们把注意力集中在潜在的经典混合规则-混沌动力学的签名上，这些动力学预计将在接近双电子原子分裂阈值的光谱中观察到，并且在电磁场作用下表现出的电子相关性上，例如，在双光子电离过程中，或者在双电子非色散波包的形成中。然而，对这个问题的理解界定了一个艰巨的理论和数值挑战，这是在复杂方法的帮助下面临的。这些联合收割机结合适当的原子哈密顿量的大规模数值计算表示。

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.