Perfectron Fxperiments on Dynamic Processes of Molecules by Means of Multi-Photon Ionization

该项目的主要目标是使用名为“Perfectron”的新型交叉束装置，通过光碎片的多光子电离来全面了解激发分子的动态过程。由于Perfectron的特征（即，完美的聚焦质量以及能量分析特性、保角映射特性、无多普勒测量方案、雅可比矩阵=1下的测量几何结构（节省了实验室到质心的转换）等），我们能够以非常高的精度测量以下项目，这是用其他传统的光碎片光谱技术很难获得的：1）测量激光过剩能量，将其分解为反冲碎片的平移自由度和内自由度。2）用各向异性因子确定双光子解离过程中间态的对称性和寿命。3）测量有机化合物的碎裂，特别是通过超激发态。

The main objective of this project is to attain a comprehensive understanding of the dynamic processes of excited molecules by means of the multi-photon ionization of photofragments using a new crossed-beam apparatus called "Perfectron". Owing to the characteristic features of the Perfectron (i.e., the perfect focusing mass as well as energy analyzing properties, the conformal mapping property, Doppler-free measuring scheme, a measuring geometry under Jacobian=1 which saves laboratory to center-of-mass transformation, and so on), we were able to measure the following items with a very high accuracy that was hardly expected to obtain with other conventional photofragment spectroscopic techniques:1) Measurements of laser excess energy partitioned into translational and internal degrees of freedom of the recoiled fragments.2) Determinations of the symmetries and life-times of intermediate states in two photon dissociation processes by means of the anisotropy factors.3) Measurements of the fragmentation of organic compounds,especially through a superexcited states.