Bicircular Attoclock with Molecules
双环分子钟
基本信息
- 批准号:498967973
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:
- 资助国家:德国
- 起止时间:
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
In this theory project, we investigate the dynamics of electrons in diatomic molecules on the attosecond time scale. We use a specially tailored form of intense light, known as a bicircular field, which is a superposition of two counter-rotating circularly polarized laser fields of different colors. The time-dependent Schrödinger equation is solved to calculate the photoelectron momentum distributions resulting from ionization of molecules by bicircular fields. From these results we infer information about the attosecond-scale temporal evolution of strong-field ionization (hence the name attoclock) and its dependence on the molecular orientation. The location of the maximum in the momentum distribution provides information about the trajectory of the outgoing electron. In this way, the attoclock serves as a nano-ruler to retrieve the birth position of the electron and the asymptotic shape of the potential. The ionization time for a specified momentum is obtained by analyzing the response to an additional probe field with variable delay. In contrast to previous attoclock schemes using light with near-circular polarization, the bicircular field has the desirable property that it can be tailored such that the ionizing-field direction is nearly constant during the escape of the electron. Moreover, in contrast to conventional linear polarization, this field avoids complications such as rescattering or interference of electron trajectories.To analyze and interpret the numerically calculated momentum distributions, we use models based on Newtonian electron trajectories. In particular, we extend the classical backpropagation method from atoms to molecules. Furthermore, we use a trajectory-free, purely quantum-mechanical method to find the ionization time from an integral representation of the time-dependent Schrödinger equation.
在这个理论项目中,我们研究了在阿秒时间尺度上双原子分子中电子的动力学。我们使用一种特别定制的强光形式,称为双环场,它是两个不同颜色的反向旋转圆偏振激光场的叠加。求解含时薛定谔方程,计算了分子在双环场作用下电离产生的光电子动量分布。从这些结果中,我们推断阿秒尺度的强场电离的时间演化的信息(因此命名为attocock)和它的依赖于分子取向。动量分布中最大值的位置提供了关于出射电子的轨迹的信息。这样,原子钟就像一把纳米尺,可以检索电子的出生位置和势的渐近形状。通过分析具有可变延迟的附加探测场的响应,得到了特定动量的电离时间。与先前使用具有近圆偏振的光的时钟方案相比,双环场具有期望的性质,即它可以被定制,使得电离场方向在电子逃逸期间几乎恒定。这个场避免了复杂的问题,如电子轨迹的再散射或干扰。为了分析和解释数值计算的动量,分布,我们使用基于牛顿电子轨迹的模型。特别地,我们将经典的反向传播方法从原子扩展到分子。此外,我们使用一个无偏的,纯量子力学的方法来找到电离时间从含时薛定谔方程的积分表示。
项目成果
期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
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Professor Dr. Manfred Lein其他文献
Professor Dr. Manfred Lein的其他文献
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{{ truncateString('Professor Dr. Manfred Lein', 18)}}的其他基金
Momentum distributions from bichromatic ionization of atoms and molecules
原子和分子双色电离的动量分布
- 批准号:
281146884 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Priority Programmes
Coherence of the electron dynamics during generation of high-order harmonics in molecules
分子中产生高次谐波期间电子动力学的相干性
- 批准号:
281078678 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Research Grants
Untersuchung von Molekülen mit zirkular polarisierten starken Feldern
圆偏振强场分子的研究
- 批准号:
229920682 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Research Grants
Theory of Molecular Quantum Dynamics in High-Harmonic Generation
高次谐波产生的分子量子动力学理论
- 批准号:
32482120 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Research Grants
相似海外基金
"Attoclock-Rabbitt" - Bicircular laser fields as tool for molecular ionization time measurements
“Attoclock-Rabbitt”——双圆激光场作为分子电离时间测量的工具
- 批准号:
411646277 - 财政年份:2018
- 资助金额:
-- - 项目类别:
Priority Programmes