Probing Multi-Electron Dynamics with Absolute Carrier-Envelope-Phase (CEP) Dependent Strong Field Interaction

利用绝对载流子包络相位 (CEP) 相关的强场相互作用探测多电子动力学

• 批准号: 2012098
• 负责人: Wen Li
• 金额: $ 53.5万
• 依托单位: Wayne State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-15 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012098&HistoricalAwards=false
• 关键词: Probing; Multi; Electron; Dynamics; Absolute

General audience abstract:Atoms are made of equal numbers of electrons and nuclei and they are charge neutral. Therefore, they should not attract each other. However, it is well known that atoms can group together and form the most complex molecules that are indispensable for life, e. g., proteins and DNAs. The reason for this is because the correlated motions of many electrons can glue atoms together. This is called chemical bonding. If one can fully understand and control these motions, one can solve many practical problems such as making new molecules as cures for diseases. However, because the multi-electron nature of chemical bonding, the issue is very complex and challenging to tackle. In this project Professor Li and students at Wayne State University will use a very intense but well-controlled laser to rip one or two electrons from atoms and small molecules and watch how they interact with the rest of the electrons as well as the laser. This is a new way to study electronic motions and will offer unprecedented knowledge that might lead to novel control methods of chemical reactions. Additional benefit includes developing new laser technologies and training of the next generation of chemists and physicists.Technical audience abstract:In this project an important aspect of multi-electron dynamics - the multi-electron Coulomb potential, its interactions with departing electrons and the consequences of such an interaction in strong field ionization process - will be investigated. The major experimental approach is to use high performing ion-electron coincidence/covariance techniques coupled with few-cycle near infrared laser pulses (5 fs). The properties of few-cycle pulses such as pulse duration, bandwidth and phase will be fully characterized. Specifically, Professor Li and his students aim to develop a new technique to determine the absolute carrier envelope phase (CEP) of linearly polarized few-cycle pulses for the first time without theoretical input. This will provide independent calibration of phase-dependent phenomena. Furthermore, the absolute CEP dependent data such as double ionization yields, electron momentum distributions and branching ratios of dissociative double ionization will be compared directly with the results of different theoretical modeling with and without the single active electron approximation (SAE) to reveal the importance of multi-electron dynamics in atomic and small molecular systems. The proposed research leverages cutting-edge experimental capabilities and will uncover new information on complex multi-electron dynamics. The research will also provide unprecedented tools for studying strong field dynamics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

普通受众摘要：原子是由相等数量的电子和核制成的，它们是中性的。因此，他们不应该互相吸引。但是，众所周知，原子可以将其分组在一起并形成最复杂的分子，这些分子是生命中必不可少的，例如。 g。，蛋白质和DNA。原因是因为许多电子的相关运动可以将原子粘合在一起。这称为化学键合。如果人们能够完全理解和控制这些动作，就可以解决许多实际问题，例如使新分子作为疾病的治疗方法。但是，由于化学键合的多电子性质，因此问题非常复杂且具有挑战性。在这个项目中，李教授和韦恩州立大学的学生将使用非常激烈但控制良好的激光撕裂原子和小分子的一个或两个电子，并观察它们如何与其他电子以及激光的相互作用。这是一种研究电子动作的新方法，并将提供前所未有的知识，这可能会导致新颖的化学反应控制方法。其他好处包括开发新的激光技术和下一代化学家和物理学家的培训。技术受众摘要：在该项目中，多电子动力学的一个重要方面 - 多电子库仑电位，其与离职电子的相互作用以及在强场上的相互作用在强场地电离过程中的影响 - 将研究。主要的实验方法是使用高性能的离子电子重合/协方差技术，并结合几个近期红外激光脉冲（5 fs）。几个周期脉冲（例如脉冲持续时间，带宽和相位）的特性将得到充分表征。具体而言，李教授和他的学生旨在开发一种新技术，以首次在没有理论输入的情况下首次线性极化的几个周期脉冲的绝对载体封装阶段（CEP）。这将提供相关现象的独立校准。此外，将直接将离解相化双电离的电子动量分布和分支比率直接与带有和不具有单个主动电子近似（SAE）的不同理论建模的结果进行比较，以揭示原子质和小分子系统中多电子动力学的重要性。拟议的研究利用了尖端的实验能力，并将发现有关复杂多电子动力学的新信息。这项研究还将提供前所未有的工具来研究强大的现场动态。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来获得支持。

项目成果

Carrier-Envelope Phase Controlling of Ion Momentum Distributions in Strong Field Double Ionization of Methyl Iodide

碘甲烷强场双电离中离子动量分布的载流子包络相位控制

• DOI: 10.1021/acs.jpca.2c06754
• 发表时间: 2023
• 期刊: The Journal of Physical Chemistry A
• 作者: Stewart, Gabriel;Debrah, Duke;Hoerner, Paul;Lee, Suk Kyoung;Schlegel, H. Bernhard;Li, Wen
• 通讯作者: Li, Wen

Three-dimensional (3D) velocity map imaging: from technique to application

三维 (3D) 速度图成像：从技术到应用

• DOI: 10.1088/1361-6455/ac4b42
• 发表时间: 2022
• 期刊: Molecular and Optical Physics
• 作者: Basnayake, Gihan;Ranathunga, Yasashri;Lee, Suk Kyoung;Li, Wen
• 通讯作者: Li, Wen

Attosecond Imaging of Electronic Wave Packets

电子波包的阿秒成像

• DOI: 10.1103/physrevlett.130.083202
• 发表时间: 2023
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Stewart, Gabriel A.;Hoerner, Paul;Debrah, Duke A.;Lee, Suk Kyoung;Schlegel, H. Bernhard;Li, Wen
• 通讯作者: Li, Wen