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
• 负责人: Professor Dr. Manfred Lein
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/281078678?language=en
• 关键词: Coherence; electron; dynamics; during; generation

The generation of high-order harmonics from molecules in strong laser pulses is an important diagnostic tool to gain insight into structure and dynamics of the molecules. High-order harmonic generation takes place as a sequence of ionisation, dynamics of the emerging electron and ion and recombination into the initial state. If the ionisation step prepares a coherent wavepacket in the ion, the wavepacket dynamics can be extracted from the observed spectrum by mapping the photon energies to a range of electron excursion times. If, however, the state of ion and electron is entangled, then the wavepacket dynamics is not fully coherent and possibly not observable. In cooperation of the groups in Hannover and Zürich, the calculation of the degree of coherence from molecular propoerties is to be investigated. The aim is the formulation of a theory that, unlike previous models, describes the general case of partially coherent wavepacket dynamics in high-order harmonic generation. This theory will be connected with existing and planned experiments at the ETH Zürich. In this context, the relaxation of molecular orbitals in the course of ionisation shall be investigated as well.

分子在强激光脉冲中产生的高次谐波是了解分子结构和动力学的重要诊断工具。高次谐波的产生是一系列的电离、新出现的电子和离子的动力学以及重新组合到初始态的过程。如果电离步骤在离子中准备了一个相干波包，则可以通过将光子能量映射到一系列电子漂移时间来从观测光谱中提取波包动力学。然而，如果离子和电子的状态是纠缠的，那么波包动力学就不是完全相干的，并且可能无法观察到。在汉诺威和苏黎世的小组的合作下，将研究从分子性质计算相干度的问题。其目的是提出一种理论，与以前的模型不同，它描述了高次谐波产生中部分相干波包动力学的一般情况。这一理论将与苏黎世工业大学现有的和计划中的实验相联系。在此背景下，还应研究电离过程中分子轨道的弛豫。

项目成果

Preparing attosecond coherences by strong-field ionization

通过强场电离制备阿秒相干

• DOI: 10.1103/physreva.93.023412
• 发表时间: 2016
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: S. Pabst;M. Lein;H.J. Wörner
• 通讯作者: H.J. Wörner