Imaging Photodissociation Dynamics of MgO at 193 nm  

时间切片离子速度成像技术关于MgO在193 nm的光解反应动力学研究

作　　者：Fang-fang Li Yu-jie Ma Jia-xing Liu Dong Yan Ang Xu Feng-yan Wang 李芳芳;马玉杰;刘嘉兴;闫东;徐昂;王凤燕(复旦大学化学系和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200438)

机构地区：[1]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 200438,China

出　　处：《Chinese Journal of Chemical Physics》2022年第2期257-262,I0001,共7页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.22073019 and No.21673047);the Shanghai Key Laboratory Foundation of Molecular Catalysis and Innovative Materials;the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning。

摘　　要：In this work,we used time-sliced ion velocity imaging to study the photodissociation dynamics of Mg O at 193 nm.Three dissociation pathways are found through the speed and angular distributions of magnesium.One pathway is the one-photon excitation of Mg O(X^(1)∑^(+))to Mg O(G^(1)Π)followed by spin-orbit coupling between the G^(1)Π,3^(3)Πand ^(1^(5))Πstates,and finally dissociated to the Mg(^(3)Pu)+O(^(3)Pg)along the 1^(5)Πsurface.The other two pathways are one-photon absorption of Mg O(A^(1)Π)state to Mg O(G^(1)Π)and Mg O(4^(1)Π)state to dissociate into Mg(^(3)P_(u))+O(^(3)P_(g))and Mg(^(1)S_(g))+O(^(1)S_(g)),respectively.The anisotropy parameters of the dissociation pathways are related to the lifetime of the vibrational energy levels and the coupling of rotational and vibronic spin-orbit states.The total kinetic energy analysis gives D0(Mg-O)=21645±50 cm^(-1).

关 键 词：Time-sliced ion velocity imaging PHOTODISSOCIATION MGO Vibrational state Excited state 193 nm 

分 类 号：O643.1[理学—物理化学]