阿秒脉冲操控分子光电子全息的研究

Photoelectron holography is a new method of imaging, which can be used for the detection of ultrafast electron dynamics, the reconstruction of atoms and molecules, the analysis of chemical reactions. It has become a hot research topic in ultrafast physics and attosecond science in recent years. Attosecond pulse can control the emission times and evolution of the emitted wave packets in strong field ionization with atttosecond precision, providing a control tool for the investigation of strong field photoelectron holography. This project intends to study the molecular photoelectron holography based on the control of photoelectron trajectory by attosecond pulse. The emission time of the photoelectron is precisely controlled by the attosecond pulse and the acceleration and motion trajectory is controlled by the infrared pulse. By optimizing the parameters of the attosecond and infrared pulses, the photoelectron orbit is precisely controlled to make one photoelectron holography is enhanced while the others are suppressed. The resolution of the molecular photoelectron holography is improved and the information of molecular structure can be obtained from the photoelectron holographic pattern. This project will promote the understanding of the control of electron quantum orbit by attosecond pulse and extend the application of molecular photoelectron holography in the detection of molecular structure information.

光电子全息是一种新的成像方法，可用于电子超快动力学探测、原子分子结构重构和化学反应解析等，是近年来超快物理和阿秒科学领域的研究热点。阿秒脉冲可以在阿秒量级控制强场电离中电子波包的出射时间和电子波包的演化，可为强场光电子全息的研究提供一种控制手段。我们拟开展利用单阿秒脉冲及阿秒脉冲链操控光电子轨道的分子光电子全息的研究。我们利用阿秒脉冲精确控制光电子的出射时间，利用近红外飞秒脉冲控制光电子的加速和运动轨迹。通过优化阿秒脉冲和近红外脉冲参数，精确地控制光电子轨道，进而达到使某一种光电子全息干涉增强而其他光电子全息干涉抑制的目的，以提高分子光电子全息图像的分辨率，并从中获取分子结构信息。本项目的研究可促进人们对阿秒脉冲操控光电子轨道的认识，并推进光电子全息在探测分子结构信息方面的应用。

光电子全息是一种全新的成像方法，是近年来超快物理和阿秒科学领域的研究热点。光电子全息过程中，两个电子在外场作用下电离。两个电子出射时间的关系决定了光电子全息的机制。本项目利用数值求解含时薛定谔方程的方法，研究了阿秒XUV脉冲驱动的双原子分子光电子全息；利用玻姆轨迹研究在红外激光场中阿秒脉冲驱动的分子光电子全息。此外，本项目还研究了椭偏场的脉宽、波长、椭偏率等因素对双电离过程中电子出射时间、出射轨道及其对双电离的电子关联特性的影响。在本项目资助下发表论文7篇，其中6篇被SCI收录。