物理学报2019，Vol.68Issue(4)：215-223,9.DOI:10.7498/aps.68.20181980
一价镧离子高n里德伯态
The study on high n Rydberg state of La II
摘要
Abstract
We analyze ionic spectrum of lanthanum via intermediate state (Xe) 5d6d3F2 in the energy region 89872-91783 cm-1, and the spectrum is obtained using five-laser resonance excitation in combination with a method of sequential ionization by a pulsed electric field and a constant electric field, and has been recalibrate in this work. Both of one strong and one weak autoionization Rydberg series converging to the La2+ state are determined. Meanwhile, the two autoionization Rydberg series are assigned by relativistic multichannel theory (RMCT) within the framework of multi-channel quantum defect theory (MQDT). More specifically, the strong autoionization Rydberg series is assigned to 5dnp(5/2,1/2)3 and/or 5dnp(5/2,1/2)2, and the weak autoionization Rydberg series is assigned to 5dnf (5/2,5/2)3 and/or 5dnf(5/2,5/2)2. We focus on the behavior of quantum defect with excitation energy for high Rydberg states, which are sensitive to the existence of a external field. We find the breakdown of quantum defect regular behavior for a specific Rydberg series and autoionization Rydberg series of La+ as the effective quantum number n*＞67. Due to that our calculations, which are obtained by relativistic multichannel theory and included configuration interactions, are in basically agreement with that for experimental low n (n*＜67) Rydberg states as well as small stray electric fields, we suggest that plasma formed by photoionization of La atoms in the second excitation step may be responsible for the breakdown of quantum defect regular behavior.关键词
量子数亏损/里德伯态/多通道量子亏损理论Key words
quantum defect/Rydberg state/relativistic multi-channel theory引用本文复制引用
李晓康,贾凤东,余方晨,李明阳,薛平,许祥源,钟志萍..一价镧离子高n里德伯态[J].物理学报,2019,68(4):215-223,9.基金项目
国家重点研发计划(批准号: 2017YFA0402300, 2017YFA0304900)、国家自然科学基金(批准号: 11604334)、中国科学院先导项目(批准号:XDPB08-3) 和低维量子物理国家重点实验室开放研究基金(批准号:KF201807) 资助的课题. （批准号: 2017YFA0402300, 2017YFA0304900）
