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High-Resolution Experimental Study on Photodissocaition of N2O
Sheng-rui Yu,Dao-fu Yuan,Wen-tao Chen,Ting Xie,Si-wen Wang,Xue-ming Yang,Xing-an Wang
Author NameAffiliationE-mail
Sheng-rui Yu Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Dao-fu Yuan Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Wen-tao Chen Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Ting Xie Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Si-wen Wang Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China  
Xue-ming Yang Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China xmyang@dicp.ac.cn 
Xing-an Wang Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;iChEM, Collaborative Innovation Center of Chemistry for Energy Materials, Hefei 230026, China xawang@ustc.edu.cn 
Abstract:
We study the photodissociation dynamics of nitrous oxide using the time-sliced ion velocity imaging technique at three photolysis wavelengths of 134.20, 135.30, and 136.43 nm. The O(1SJ=0)+N2(X1g+) product channels were investigated by measuring images of the O(1SJ=0) products. Vibrational states of N2(X1g+) products were fully resolved in the images. Product total kinetic energy releases (TKER) and the branching ratios of vibrational states of N2 products were determined. It is found that the most populated vibrational states of N2 products are v=2 and v=3. The angular anisotropy parameters (β values) were also derived. The β values are very close to 2 at low vibrational states of the correlated N2(X1g+) products at all three photolysis wavelengths, and gradually decrease to about 1.4 at v=7. This indicates the dissociation is mainly through a parallel transition state to form products at lower vibrational states, and the highly vibrational exited products are from a more bent configuration. This is consistent with the observed shift of the most intense rotational structure in the TKER as the vibrational quantum number increases.
Key words:  N2O  Ion imaging  Vacuum ultraviolet  Photodissociation
FundProject:
高分辨的一氧化二氮光解离实验研究
俞盛锐,袁道福,陈文韬,谢婷,王思雯,杨学明,王兴安
摘要:
利用"时间切片"离子速度成像技术研究了N2O分子在134.20、135.20和136.43 nm波长下的真空紫外光解动力学. 实验中通过采集解离产物O(1SJ=0)的离子影像来研究O(1SJ=0)+N2(X1g+)这一解离通道. 从各个波长下的实验影像可获得产物N2(X1g+)的振动态分辨的结构,进而得到产物的总平动能谱和产物N2的振动态布居. 实验结果表明在实验的光解波长下,产物N2(X1g+)主要布居在v=2和v=3. 此外,还得到了产物N2的振动态分辨的各向异性参数β,从中发现产物N2β值在三个解离波长下均表现出相似的特征,即随着振动量子数的增大,β值从趋近于2逐渐减小至1.4. 这一现象表明低振动态产物是通过一个以平行跃迁解离为主的解离过程产生的,而高振动态的产物来自于一个更加弯曲的中间构型的解离. 此推论与在平动能谱中所见到的最强转动态布居随着振动量子数的增大而出现的位移是相一致的.
关键词:  一氧化二氮  离子成像  真空紫外  光解
DOI:10.1063/1674-0068/29/cjcp1512256
分类号: