窄脉冲分子束系统的发展与表征  

Development and Characterization of a Narrow-Pulsed Molecular Beam System

作　　者：谢雨润 刘和洋 肖越 韩杰 李之超 王禹朝 汪涛 杨学明 杨天罡[1] Yurun Xie;Heyang Liu;Yue Xiao;Jie Han;Zhichao Li;Yuzhao Wang;Tao Wang;Xueming Yang;Tiangang Yang(Shenzhen Key Laboratory of Energy Chemistry&Department of Chemistry,Southern University of Science and Technology,Shenzhen 518055,China;.State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Science,Dalian 116023,China;Hefei National Laboratory,Hefei 230088,China;Institute of Advanced Science Facilities,Shenzhen 518107,China)

机构地区：[1]南方科技大学化学系,深圳市能源化学重点实验室,深圳518055 [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]合肥国家实验室,合肥230088 [4]深圳综合粒子设施研究院,深圳518107

出　　处：《Chinese Journal of Chemical Physics》2023年第3期259-264,I0099,共7页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.22103023,No.22173040,No.22241301,No.22103032,No.22173042,and No.21973037);the Shenzhen Science and Technology Innovation Committee(No.ZDSYS20200421111001787,No.JCYJ20210324103810029,No.20220815145746004,and No.2021344670);the Guangdong Innovative&Entrepreneurial Research Team Program(No.2019ZT08L455 and No.2019JC01X091);Innovation Program for Quantum Science and Technology(No.2021ZD0303304).

摘　　要：本文结合高速分子斩波器与温度可调的脉冲阀,搭建了一套制备脉冲宽度窄且速度连续可调的分子束装置.通过共振增强多光子电离方法对分子束的脉冲宽度与速度进行了表征.测量表明斩波器可将氢气分子束在脉冲阀下游约193 mm处的脉冲宽度从20.0μs缩短到6.3 us.为了精确测量氢气分子的速度,实验采用了受激拉曼泵浦和共振增强多光子电离结合的泵浦-探测方法,利用纳秒级的受激拉曼泵浦脉冲激光作为测量时间零点,在标记分子飞行固定距离(193 mm)后精确测量分子到达时间以获得分子束速度同时通过改变脉冲阀的温度,实现氢气分子束速度在1290~3550 m/s之间的连续调节.本文搭建的系统在化学反应动力学领域有多种潜在应用,包括与离子阱以及分子束表面散射装置结合进行实验研究.A narrow-pulsed and velocity-controlled molecular beam system is constructed by using a high-speed chopper and a temperature adjustable pulsed valve.The duration of the hydrogen molecular beam pulse is reduced to approximately 6.3µs and characterized using resonance-enhanced multiphoton ionization(REMPI)at a distance of∼193 mm downstream from the nozzle.To precisely determine the velocity of the hydrogen molecules,a pump-probe technique combining stimulated Raman pumping and REMPI is employed at a fixed distance(193 mm)with nanosecond lasers.By adjusting the temperature of the pulsed valve,the velocity of the hydrogen beam varies continuously from 1290 m/s to 3550 m/s.The system exhibits potential for multiple applications in the field of chemical reaction dynamics,including its potential to integrate with ion traps and surface scattering experiments.

关 键 词：分子束 化学反应动力学 共振增强多光子电离 

分 类 号：O643.1[理学—物理化学]