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arXiv 1408.4541physics.atom-ph
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电子与超短脉冲相互作用的包络哈密顿量

The envelope Hamiltonian for electron interaction with ultrashort pulses

Koudai Toyota, Ulf Saalmann, Jan M. Rost

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5 pages, 3 figures
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摘要：

对于脉冲长度与它们耦合的束缚电子的轨道时间相当的超短VUV脉冲，我们提出了一个简化的包络哈密顿量。它是基于Kramers-Henneberger表示与Floquet扩展的强场动力学，但保持明确的脉冲包络的时间依赖性。因此，包络哈密顿量捕获的物理本质，-光诱导的束缚态，单光子吸收，和非绝热电子跃迁的位移。它提供定量准确的电离动力学，并允许物理洞察发生的过程。它对激光参数的最低要求使其非常适合于大类原子和分子问题。

英文摘要：

For ultrashort VUV pulses with a pulse length comparable to the orbital time of the bound electrons they couple to we propose a simplified envelope Hamiltonian. It is based on the Kramers-Henneberger representation in connection with a Floquet expansion of the strong-field dynamics but keeps the time dependence of the pulse envelope explicit. Thereby, the envelope Hamiltonian captures the essence of the physics, -- light-induced shifts of bound states, single-photon absorption, and non-adiabatic electronic transitions. It delivers quantitatively accurate ionization dynamics and allows for physical insight into the processes occurring. Its minimal requirements for construction in terms of laser parameters make it ideally suited for a large class of atomic and molecular problems.

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