中文摘要：

新建了一个用于飞秒时间分辨分子反应动力学研究的离子／电子速度成像仪．通过结合千赫兹的脉冲阀和增强型CCD相机，该成像仪工作频率提高到千赫兹，与商业化的钛宝石飞秒激光系统相匹配，大大提高了气相中飞秒时间分辨分子反应动力学研究的效率．利用该成像仪，初步研究了氨分子在200nm的非绝热光解动力学．飞秒时间分辨的H原子产物平动能谱提供了关于该光解过程丰富的动力学信息．这些结果表明，该千赫兹成像仪将成为用于飞秒时间分辨分子反应动力学研究的重要实验方法之一．

英文摘要：

A new velocity map imaging spectrometer is constructed for molecular reaction dynamics studies using time-resolved photoelectron/ion spectroscopy method. By combining a kHz pulsed valve and an ICCD camera, this velocity map imaging spectrometer can be run at a repetition rate of 1 kHz, totally compatible with the fs Ti：Sapphire laser system, facilitating time-resolved studies in gas phase which are usually time-consuming. Time-resolved velocity map imaging study of NH3 photodissociation at 200 nm was performed and the time-resolved total kinetic energy release spectrum of H＋NH~ products provides rich information about the dissociation dynamics of NH3. These results show that this new apparatus is a powerful tool for investigating the molecular reaction dynamics using time-resolved methods.