Branching ratios of autoionization from Eu 4f^76p_(1/2)6d [J] autoionizing states  

作　　者：闫俊刚 沈礼 梁洪瑞 戴长建 

机构地区：[1]Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education [2]School of Science, Tianjin University of Technology

出　　处：《Chinese Physics B》2015年第8期296-301,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11174218)

摘　　要：The autoionization branching ratios from Eu 4f76p1/26 d [J] autoionizing states to its 4f76s+(9So), 4f76s+(7So), and4f75d+(9Do) final ionic states are investigated with the combination of the three-step laser excitation and the velocity-map imaging technique. These different autoionizing states are excited via 4f76s6d8 DJ [J = 5/2, 7/2, and 9/2] intermediate states, respectively. The experimental photoelectron images are obtained, from which energy distributions of ejected electrons are achieved with the mathematical transformation. Furthermore, the energy dependence of the branching ratio is investigated within the autoionization resonance, by which population inversion is observed as an important characteristic.The J-dependence is also studied systematically. The validity of the well-known isolated core excitation technique used for obtaining the autoionization spectrum is also studied.The autoionization branching ratios from Eu 4f76p1/26 d [J] autoionizing states to its 4f76s+(9So), 4f76s+(7So), and4f75d+(9Do) final ionic states are investigated with the combination of the three-step laser excitation and the velocity-map imaging technique. These different autoionizing states are excited via 4f76s6d8 DJ [J = 5/2, 7/2, and 9/2] intermediate states, respectively. The experimental photoelectron images are obtained, from which energy distributions of ejected electrons are achieved with the mathematical transformation. Furthermore, the energy dependence of the branching ratio is investigated within the autoionization resonance, by which population inversion is observed as an important characteristic.The J-dependence is also studied systematically. The validity of the well-known isolated core excitation technique used for obtaining the autoionization spectrum is also studied.

关 键 词：Eu atom velocity-map imaging autoionizing state autoionization branching ratio 

分 类 号：O562[理学—原子与分子物理]