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Laser Ablation Atomic Beam Apparatus with Time-Sliced Velocity Map Imaging for Studying State-to-State Metal Reaction Dynamics
Chang-wu Dong, Jia-xing Liu, Fang-fang Li, Feng-yan Wang
Department of Chemistry, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China
Abstract:
We report a newly constructed laser ablation crossed molecular beam apparatus, equipped with time-sliced velocity map imaging technique, to study state-to-state metal atom reaction dynamics. Supersonic metal atomic beam is generated by laser vaporization of metal rod, and free expansion design without gas flow channel has been employed to obtain a good quality of metal atomic beam. We have chosen the crossed-beam reaction Al+O2 to test the performance of the new apparatus. Two-rotational-states selected AlO(X2+, v=0, N and N+14) products can be imaged via P(N) and R(N+14) branches of the Δv=1 band at the same wavelength, during (1+1) resonance-enhanced multi-photon ionization through the AlO(D2+) intermediate state. In our experiment at 244.145 nm for simultaneous transitions of P(15) and R(29) branch, two rings in slice image were clearly distinguishable, corresponding to the AlO(v=0, N=15) and AlO(v=0, N=29) states respectively. The energy difference between the two rotational levels is 403 cm-1. The success of two states resolved in our apparatus suggests a better collisional energy resolution compared with the recent research study [J. Chem. Phys. 140, 214304 (2014)].
Key words:  Time-sliced velocity map imaging  Crossed beam  Laser ablation  Metal atom reaction dynamics
FundProject:
利用激光溅射原子束装置结合时间切片速度成像技术对于金属态-态反应动力学的相关研究
董常武, 刘嘉兴, 李芳芳, 王凤燕
复旦大学化学系, 化学能源材料协同创新中心, 上海 200433
摘要:
利用新建激光溅射交叉分子束装置,结合时间切片速度成像技术开展了金属原子态-态反应动力学的相关研究. 超声金属原子束是由激光溅射金属棒产生,结合无气体溢流通道的自由扩散设计,得到了质量很好的金属原子超声束. 本文选择Al+O2反应体系来测试新建金属交叉分子束实验装置的性能. 通过(1+1) 共振多光子电离技术,以AlO(D2+)为中间态来探测特定转动态的产物AlO自由基. 相同波长下可以同时得到反应产物AlO(X2+,v=0,NN+14)两个转动态的速度成像,分别对应着Δv=1的P(N)和R(N+14)跃迁. 在244.145 nm同时探测到P(15)和R(29)的跃迁,形成的两个环在切片成像图中可以完全区分开,这两个跃迁分别对应着反应产物AlO(v=0,N=15)和AlO(v=0,N=29)两个转动态. 对应此两个转动态的能级差为403 cm-1. 这两个反应产物转动态的区分表明了该实验装置与最近的一篇研究报道[J. Chem. Phys. 140, 214304 (2014)]相比较,具有较好的碰撞能量分辨率.
关键词:  时间切片速度成像  交叉分子束  激光溅射  金属原子反应动力学
DOI:10.1063/1674-0068/29/cjcp1512261
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