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CS分子在207 nm的光解动力学研究:S(1D2)+CO(X1Σ+)产物通道
白西林*1, 赵东锋2, 陈 旸2
1.山西师范大学物理与信息工程学院,临汾 041004;2.中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,量子信息与量子科技前沿协同创新中心,合肥 230026
摘要:
利用直流时间切片离子成像技术对OCS分子在紫外波段207 nm的光解产物S(1D2)进行了偏振实验研究. 通过在两种不同的共振增强多光子电离中间态,1F31P1, 以及四种不同的泵浦-探测激光偏振几何构型下探测了光碎片S(1D2)的角动量极化特性. 使用分子坐标系极化模型和实验室坐标系各向异性模型提取和分析出对应产物CO(X1Σ+)的角分布.观测到的总平动能释放谱表明解离过程存在三种解离通道,分别对应于低、中、高平动能解离通道. 低、中平动能通道的来源与光解波长在较长波长下得到的双峰分布来源一致. 高平动能通道是一种新的解离通道,它来自于单重排斥态A(21A')的直接解离.
关键词:  光解动力学,OCS,离子速度成像
DOI:10.1063/1674-0068/cjcp1908148
分类号:
基金项目:
Photodissociation Dynamics of OCS at 207 nm: S(1D2)+CO(X1Σ+) Product Channel
Xi-lin Bai*1, Dong-feng Zhao2, Yang Chen2
1.School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China;2.Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
By using the direct current slice velocity map imaging technique, the polarization experiment for S(1D2) product from the ultraviolet photodissociation of carbonyl sulfide at 207 nm was studied. The angular momentum polarization character of the photofragment S(1D2) was detected via two different resonance enhanced multiphoton ionization intermediate states, 1F3 and 1P1, and four different pump-probe laser polarization geometries. The angular distribution of the corresponding CO(X1Σ+) coproducts was extracted and analyzed using the molecular-frame polarization and the laboratory-frame anisotropy models. The observed total kinetic energy release spectrum indicates that there are three dissociation channels, corresponding to the low, medium, and high kinetic energy. The sources of the low and medium kinetic energy channels are consistent with those of bimodal translational energy distribution at longer photolysis wavelengths. The high kinetic energy channel is a new dissociation channel arising from the direct dissociation from the single repulsive A(21A') state.
Key words:  Photodissociation dynamics, Carbonyl sulfide, Velocity map imaging
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