Ion-Neutral Photofragment Coincidence Imaging of Photodissociation Dynamics of Ionic Species  

利用离子-中性光解碎片符合成像研究离子光解动力学

作　　者：Ze-feng Hua Yun-xiao Zhao You-qing Li Gao-ming Hu Yang Chen Dong-feng Zhao 华泽丰;赵云肖;李佑卿;胡高明;陈场;赵东锋(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,合肥230026)

机构地区：[1]CAS Center for Excellence in Quantum Information and Quantum Physics,Hefei National Laboratory for Physical Sciences at the Microscale,and Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2021年第1期81-86,I0011,I0012,共8页化学物理学报（英文）

基　　金：This work was supported by the National Key R&D Program of China(No.2017YFA0303502);the National Natural Science Foundation of China(No.21773221 and No.21827804);the Fundamental Research Funds for the Central Universities of China(No.WK2340000078).

摘　　要：The recen tly cons true ted cryogenic cylindrical ion trap velocity map imaging spectrometer(CIT-VMI)has been upgraded for coincidence imaging of both ionic and neutral photofragments from photodissociation of ionic species.The prepared ions are cooled down in a homemade cryogenic cylindrical ion trap and then extracted for photodissociation experiments.Wi th the newly designed elec trie fields for extraction and acceleration,the ion beam can be accelerated to more than 4500 eV,which is necessary for velocity imaging of the neutral photofragments by using the position-sensitive imaging detect or.The setup has been tested by the 355 nm pho todissocia tion dynamics of the argon dimer cat ion(Ar2+).From the recorded experimen tal images of both neu tral Ar and ionic Ar+fragments,we interpret velocity resolutions of△v/vu4.6%for neutral fragments,and△v/vul.5%for ionic fragments,respectively.

关 键 词：Ion trap Velocity map imaging photofragment coincidence imaging 

分 类 号：O643.1[理学—物理化学]