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Imaging Reaction Dynamics of Y+SO2
Dong Yan, Yu-jie Ma, Fang-fang Li, Jia-xing Liu, Guan-jun Wang, Feng-yan Wang*
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fudan University, Shanghai 200433, China
Abstract:
The reaction dynamics of yttrium atoms with sulfur dioxide molecules at a high collision energy of 36 kcal/mol was studied using time-sliced velocity map ion imaging, crossed molecular beam and laser-ablation method. The product YO was detected via multiphoton ionization at various wavelengths in the region of 482-615 nm. The slice images of YO show a broad velocity distribution and forward-backward peaking angular distribution. The forward scattering signal is stronger than its backward distribution. This indicates that the reaction proceeds via an intermediate complex and the lifetime of the intermediate state is less than one rotational period. The formation of complex suggests that electron transfer occurs in the oxidation reaction.
Key words:  Time-sliced velocity map imaging, Crossed-beam, Laser ablation, Metal atom reaction dynamics, SO2
FundProject:
附件
Y+SO2反应动力学成像
闫 东, 马玉杰, 李芳芳, 刘嘉兴, 王冠军, 王凤燕*
复旦大学化学系,上海市分子催化和功能材料重点实验室,能源材料化学协同创新中心,上海 200433
摘要:
本文利用时间切片离子速度成像技术、交叉分子束和激光溅射技术研究了高碰撞能下(36 kcal/mol)钇原子与二氧化硫分子的反应动力学. 利用多光子电离在482∽615 nm的波长范围内得到了产物YO的时间切片离子速度成像. YO的切片图像显示其较宽的速度分布和前-后向散射为主的角分布,其中前向散射信号明显强于后向散射. 这种空间分布暗示了该反应通过一个中间体进行,且中间体的寿命不超过一个转动周期. 中间体的形成意味着该氧化反应电子转移机理的发生.
关键词:  时间切片离子速度成像,交叉分子束,激光溅射,金属原子反应动力学,二氧化硫
DOI:10.1063/1674-0068/cjcp2002029
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