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arXiv physics/0606091physics.atom-phphysics.chem-phphysics.comp-ph
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H $_2^+$在强laser场中的详细瞬时电离率

Detailed instantaneous ionization rate of H$_2^+$ in intense laser field

Mohsen Vafaee, Hassan Sabzyan, Zahra Vafaee, Ali Katanforoush

摘要:

介绍了组分瞬时电离率(IIR)的概念及其计算方法。通过直接数值求解固定核全维含时薛定谔方程,计算了在$1.0 \times10^{14}$ W cm $^{-2}$强度和$λ\sim 1064 $ nm波长的线偏振激光场中,不同核间距下H $_2^+$的组分电离率和总组分电离率(时均).准确的整体组件电离率计算的时间平均的组件IIR的比较与那些计算近似通过虚拟检测器方法(VD)。利用计算得到的H $_2^+$系统的IIR分量,详细研究了亚飞秒时间尺度强激光场中H系统的出、入射电子波包随时间的变化规律.结果清楚地表明,IIR的正(出射电子波包)信号及其z分量是强而尖锐的,而负(返回电子波包)信号是平滑而微弱的。IIR的$ρ$组分的结构具有光滑的结构。研究了与R相关的电离率与激光脉冲斜波持续时间的关系,结果表明,当核间距R<5.6时,当激光脉冲无斜波开启时,与R相关的电离率的第一个峰向与时间相关的Floquet准能态(QES)的峰移动。

英文摘要:

Component instantaneous ionization rate (IIR) is introduced and the approach of its calculation is formulated. The component IIR's and the overall (time-averaged) component ionization rates are calculated for H$_2^+$ at different values of inter-nuclear distance in a linearly polarized laser field with $1.0 \times10^{14}$W cm$^{-2}$ intensity and $λ\sim 1064 $nm wavelength by direct numerical solution of the fixed-nuclei full dimensional time-dependent Schr ödinger equation. The exact overall component ionization rates calculated by time-averaging of the component IIR are compared with those calculated approximately via the virtual detector method (VD). Details of the time dependent behavior of the outgoing and incoming electron wavepackets of the H$_2^+$ system in intense laser field at sub-femtosecond time scale are studied based on the calculated component IIR. It is shown clearly that the positive (outgoing electron wavepacket) signals of the IIR and its z component are strong and sharp but the negative (returning electron wavepacket) signals of the IIR are smooth and weak. The structure of the $ρ$ component of the IIR has smooth structure. Relation between the R-dependent ionization rate and duration of the ramp of the laser pulse is studied and it is explicitly shown that for internuclear distance R<5.6, when the laser pulse is turned on without a ramp, the first peak of R-dependent ionization rates moves towards the peak of the lower time dependent Floquet quasi-energy state (QES).

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