基于分子坐标系的分子超快光解离动力学研究

With the development of ultrafast laser technology, molecular alignment and orientation have been investigated experimentally and theoretically. Combined with molecular alignment and orientation, time-resolved X-ray and electron diffraction, tomographic orbital imaging, time-resolved photoelectron spectroscopy, laser-induced electron diffraction, and harmonic generation can presage a wide range of insights obtainable in the molecular reference frame. In this proposal, we intend to investigate the molecular ultrafast photodissociation dynamics from two aspects: on the one hand, we intend to use femtosecond time-resolved photoelectron imaging to study the molecular ultrafast photodissociation dynamics in the laboratory reference frame; on the other hand, we intend to explore the molecular ultrafast photodissociation dynamics in the molecular reference frame after aligning the molecules using an 800 nm femtosecond laser pulse. By comparing the experimental results obtained in the laboratory reference frame and in the molecular reference frame, we want to present the detail information about the molecular ultrafast photodissociation dynamics, emphasis the importance of experimental results in the molecular frame and achieve the expectation that studying the molecular ultrafast photodissociation dynamics at the molecular scale.

随着超快激光技术的发展，分子取向和定向在实验和理论上已经被广泛研究。将分子取向和定向与时间分辨X射线衍射、时间分辨电子衍射、层析轨道成像、时间分辨光电子谱、激光诱导电子衍射以及高次谐波产生等技术结合起来，人们可以从分子坐标系实时研究分子结构的变化，给出分子结构更详尽的信息。本项目拟从两方面着手：一方面利用飞秒时间分辨光电子影像技术在实验室坐标系下研究分子的超快光解离动力学；另一方面，利用800nm飞秒激光将分子实现取向后，利用飞秒时间分辨光电子影像技术在分子坐标系下研究分子的超快光解离动力学。本项目通过比较实验室坐标系下和分子坐标系下的实验结果，给出分子超快光解离动力学更详尽的信息，揭示分子坐标系下研究分子超快光解离动力学的重要性，真正实现在分子层次研究分子的超快光解离动力学。

随着超快激光技术的发展，分子取向和定向在实验和理论上已经被广泛研究。将分子取向和定向与时间分辨X射线衍射、时间分辨电子衍射、层析轨道成像、时间分辨光电子谱、激光诱导电子衍射以及高次谐波产生等技术结合起来，我们可以从分子坐标系实时研究分子结构的变化，给出分子结构更详尽的信息。在本项目中，我们首先研究了在一个单色飞秒激光场的作用下，激光脉冲的脉冲宽度、激光强度和转动温度对激光场中N2O分子取向的影响；其次，我们研究了在固定温度，固定脉冲宽度，两个飞秒激光脉冲的光强加起来等于一个单色飞秒激光脉冲固定脉冲宽度时的饱和光强的情况下，两个单色飞秒激光脉冲的延迟时间对N2O分子取向的影响，为在分子坐标系下研究N2O分子超快光解离动力学奠定了基础。