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Application of Laser Dispersion Method in Apparatus Combining H Atom Rydberg Tagging Time-of-Flight Technique with Vacuum Ultraviolet Free Electron Laser
Yao Chang1,2, Zhi-gang He2, Zi-jie Luo2,3, Jia-mi Zhou2, Zhi-guo Zhang*4, Zhi-chao Chen2,3, Jia-yue Yang2,3, Yong Yu2,3, Qin-ming Li2,3, Li Che3, Guo-rong Wu2,3, Xing-an Wang1, Xue-ming Yang2,3, Kai-jun Yuan*2,3
1.Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;2.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;3.Department of Physics, School of Science, Dalian Maritime University, Dalian 116026, China;4.Key Laboratory of Functional Materials and Devices for Informatics of Anhui Higher Education Institutions and School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236041, China
Abstract:
Photodissociation of H2S in the VUV region plays an important role in the atmospheric chemistry and interstellar chemistry. To date, however, few studies have been focused on this topic. In this article, we have described a laser dispersion method applied in the apparatus combining the high-n H atom Rydberg tagging time-of-flight technique with the vacuum ultraviolet free electron laser (VUV FEL). The Lyman-α laser beam (121.6 nm) used in the H-atom detection was generated by the difference frequency four-wave mixing schemes in a Kr/Ar gas cell. After passing through an off-axis biconvex LiF lens, the 121.6 nm beam was dispersed from the 212.6 nm and 845 nm beams due to the different deflection angles experienced by these laser beams at the surfaces of the biconvex lens. This method can eliminate the background signal from the 212.6 nm photolysis. Combined with the VUV FEL, photodissociation of H2S at 122.95 nm was studied successfully. The TOF spectrum was measured and the derived total kinetic energy release spectrum was displayed. The results suggest that the experimental setup is a powerful tool for investigating photodissociation dynamics of molecules in the VUV region which involves the H-atom elimination processes.
Key words:  Photodissociation, Vacuum ultraviolet, Free electron laser
FundProject:
附件
分光技术在自由电子激光结合里德堡态氢原子飞行时间谱装置中的应用
常 尧1,2, 贺志刚2, 罗子杰2,3, 周家米2, 张志国*4, 陈志超4, 杨家岳2, 余 永2, 李钦明2, 车 丽3, 吴国荣2, 王兴安1, 杨学明2, 袁开军*2
1.中国科学技术大学化学物理系,合肥 230026;2.中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连 116023;3.大连海事大学物理系,大连 116026;4.阜阳师范大学物理与电子工程学院,信息功能材料结构与器件安徽省高校重点实验室,阜阳 236041
摘要:
本文描述了一种应用于自由电子激光结合高里德堡态氢原子飞行时间谱装置中的分光方法,以及该方法应用于小分子(如2S)光解动力学研究中的必要性. 拉曼-α辐射(121.6 nm),用作H原子产物探测的激光,是在Kr/Ar气介质中利用四波混频产生的. 利用透镜对不同波长的光有不同的折射率,四波混频后的混合光在经过一片离轴的氟化锂透镜后,121.6 nm的激光将会与212.6和845 nm在空间上分开. 在激光到达反应中心前利用挡板挡住212.6和845 nm的激光,只让121.6 nm的光经过反应中心,从而消除212.6 nm激光产生的背景信号对实验的干扰. 结合自由电子激光,成功地研究了H2S在122.95 nm波长下的光解动力学,采集到了产物时间飞行谱. 本文展示了转换得到的产物总平动能谱,解离机理与121.6 nm波长下的结果相似. 实验结果显示,该方法成功地解决了分子在VUV波段进行光解动力学研究的难题,消除了这些分子在紫外光波段因为强烈吸收而产生的背景信号.
关键词:  光解动力学,自由电子激光,分光系统
DOI:10.1063/1674-0068/cjcp2001008
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