强脉冲Laser对原子电离的影响
Ionization of Atoms by Intense Laser Pulses
摘要：
在偶极近似下，研究了红外短脉冲激光电离氢原子的过程。令$A$表示脉冲的电场在原子核位置处随时间的积分。结果表明，在极限$|A| \to \infty$，电离概率接近统一和电子被弹射到一个圆锥开口方向的$-A$和任意小的开口角。详细研究了$|A|^{-1}$中各物理量的渐近性。我们的结果与\cite{1,2}中报道的实验数据定性一致。
英文摘要：
The process of ionization of a hydrogen atom by a short infrared laser pulse is studied in the regime of very large pulse intensity, in the dipole approximation. Let $A$ denote the integral of the electric field of the pulse over time at the location of the atomic nucleus. It is shown that, in the limit where $|A| \to \infty$, the ionization probability approaches unity and the electron is ejected into a cone opening in the direction of $-A$ and of arbitrarily small opening angle. Asymptotics of various physical quantities in $|A|^{-1}$ is studied carefully. Our results are in qualitative agreement with experimental data reported in \cite{1,2}.
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