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arXiv physics/0607153physics.atom-ph
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电离过程密度泛函处理中关联函数的绝热近似

Adiabatic Approximation of the Correlation Function in the Density-Functional Treatment of Ionization Processes

F. Wilken, D. Bauer

摘要:

用含时密度泛函理论研究了一维模型氦原子在短脉冲激光作用下的电离。我们计算电离几率作为激光强度的函数近似的关联函数的系统与明确的依赖于束缚电子的分数。对于关联势,我们采取的衍生物的不连续性在整数个绑定电子明确考虑。这种方法再现电离概率从随时间变化的薛定谔方程的解决方案,特别是所谓的“膝盖”,由于非顺序电离。

英文摘要:

The ionization of a one-dimensional model Helium atom in short laser pulses using time-dependent density functional theory is investigated. We calculate ionization probabilities as a function of laser intensity by approximating the correlation function of the system adiabatically with an explicit dependence on the fractional number of bound electrons. For the correlation potential we take the derivative discontinuity at integer numbers of bound electrons explicitly into account. This approach reproduces ionization probabilities from the solution of the time-dependent Schroedinger equation, in particular the so-called "knee" due to nonsequential ionization.

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