亚飞秒极紫外laser脉冲电离的库仑-伏尔科夫方法
Coulomb-Volkov approach of ionization by extreme ultraviolet laser pulses in the subfemtosecond regime
摘要：
在原子和短的高频极紫外激光脉冲之间的相互作用是一个扰动的条件下，我们表明，一个简单的理论方法，基于库仑-Volkov型状态，可以作出可靠的预测电离。为了避免任何额外的近似，我们在这里考虑一个标准的情况：电离的氢原子最初在其基态。对于任何场参数，我们表明，该方法提供了准确的能谱的喷射电子，包括许多以上的阈值电离峰，只要同时满足以下两个条件：（i）光子能量大于或等于电离势;（ii）电离过程是不饱和的。因此，目前产生的高次谐波激光脉冲对原子或分子的电离可以通过这种库仑-沃尔科夫处理来解决。
英文摘要：
In conditions where the interaction betweeen an atom and a short high-frequency extreme ultraviolet laser pulse is a perturbation, we show that a simple theoretical approach, based on Coulomb-Volkov-type states, can make reliable predictions for ionization. To avoid any additional approximation, we consider here a standard case : the ionization of hydrogen atoms initially in their ground state. For any field parameter, we show that the method provides accurate energy spectra of ejected electrons, including many above threshold ionization peaks, as long as the two following conditions are simultaneously fulfilled : (i) the photon energy is greater than or equal to the ionization potential ; (ii) the ionization process is not saturated. Thus, ionization of atoms or molecules by the high order harmonic laser pulses which are generated at present may be addressed through this Coulomb-Volkov treatment.
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