The 4p6 core excited autoionising states in strontium:: Classification and excitation dynamics

被引:7
作者
Borovik, A. [1 ]
Vakula, V. [1 ]
Kupliauskiene, A. [2 ]
机构
[1] Natl Acad Sci Ukraine, Inst Elect Phys, UA-88017 Uzhgorod, Ukraine
[2] Vilnius State Univ, Inst Theoret Phys & Astron, LT-01108 Vilnius, Lithuania
来源
LITHUANIAN JOURNAL OF PHYSICS | 2007年 / 47卷 / 02期
关键词
autoionisation; cascade transition; negative-ion state; resonance;
D O I
10.3952/lithjphys.47203
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The ejected electron spectra corresponding to the electron decay of the 4p(5)n(1)l(1)n(2)l(2)n(3)l(3) low-lying autoionising states in strontium atoms were measured in the impact energy range from the excitation threshold of states up to 200 eV. By using the results of single-configuration Hartree-Fock (HF) calculations, six ejected electron lines with the lowest excitation thresholds were attributed to the decay of the (4P(5)4d5s(2))(3) P-0,P-1,P-2 and F-3(2,3,4) autoionising states. For the P-3(1,2) and F-3(4) states the excitation functions were obtained at an incident electron energy resolution of 0. 15 eV. In all excitation functions the strong near-threshold structure was revealed for the first time. The origin of the structure was attributed to the decay of short-lived states from the 4p(5)5s(2)4d(2) configuration of Sr- ion. The cascade population of the P-3(0,1,2) and F-3(2,3,4) states was considered by Ming the HF energies and decay probabilities for the 4p(5)5s(2)5p levels.
引用
收藏
页码:129 / 135
页数:7
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