多原子分子激发态弛豫机制的时间分辨光电子-光离子符合谱测量

项目名称： 多原子分子激发态弛豫机制的时间分辨光电子-光离子符合谱测量

项目编号： No.10874056

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 生物科学

项目作者： 徐海峰

作者单位： 吉林大学

项目金额： 42万元

中文摘要： 本项目以飞秒激光为光源，建立时间分辨的光电子-光离子符合测量方法，研究若干多原子分子体系在飞秒激光场中的电离/解离以及电子激发态的弛豫机制。项目研究了卤代烷烃分子的电离解离通道以及库伦爆炸过程，获得了相关过程的能量分布、角度分布以及碎片通道等，对飞秒激光场中的准直机制进行了细致的分析；利用双色飞秒激光泵浦探测方法，研究了多原子分子电子激发态的超快时间分辨的弛豫动力学过程，获得了不同演化途径的时间特性，对分子激发态的演变机理有更清楚的认识。项目研究加深了对多原子分子在飞秒激光场中的激发-弛豫-电离过程，以及激发态的相互作用和超快弛豫动力学过程的理解，为掌握和控制复杂分子体系的相互作用以及分子在超短脉冲激光下的行为提供实验基础。

中文关键词： 电子-离子测量；时间分辨；飞秒激光；多原子分子；超快

英文摘要： We have established an instrument for ion-electron coincident measurement using femtosecond laser, and have investigated ionization/dissociation process and evolution of electronic excited states of multiple-atom molecules in fs laser field. The ionization/dissociation as well as coulomb explosion mechanisms of halogenated methane such as CH2I2 were investigated, the energy and angular distributions and different fragmentation channels were obtained; With utilization of two-color fs pump-probe method, we have studied time-resolved ultrafast dynamics of several molecules, and have obtained transient spectra of different channels. Our study have shed light on the excitation-evolution-ionization process in femtosecond laser field, and have added understanding of interaction and dynamics of excited states of molecules,thus have provided experimental information to master and control the dynamics of molecules irradiated by ultrashort laser pulse.

英文关键词： electron-ion coincident; time-resolved; femtosecond laser; multiple-atom molecule; ultrafast