Identification of the 1s2s2p 4P5/2→1s22s 2S1/2 magnetic quadrupole inner-shell satellite line in the Ar16+K-shell x-ray spectrum -: art. no. 032504

被引:24
作者
Beiersdorfer, P [1 ]
Bitter, M
Hey, D
Reed, KJ
机构
[1] Lawrence Livermore Natl Lab, Dept Phys & Adv Technol, Livermore, CA 94551 USA
[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
来源
PHYSICAL REVIEW A | 2002年 / 66卷 / 03期
关键词
D O I
10.1103/PhysRevA.66.032504
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We have identified the dipole-forbidden 1s2s2p P-4(5/2)-->1s(2)2s S-2(1/2) transition in lithiumlike Ar15+ in high-resolution K-shell x-ray emission spectra recorded at the Livermore EBIT-II electron-beam ion trap and the Princeton National Spherical Tokamak Experiment. Unlike other Ar15+ satellite lines, which can be excited by dielectronic recombination, the line is exclusively excited by electron-impact excitation. Its predicted radiative rate is comparable to that of the well-known 1s2p P-3(1)-->1s(2) S-1(0) magnetic quadrupole transition in helium-like Ar16+. As a result, it can also only be observed in low-density plasma. We present calculations of the electron-impact excitation cross sections of the innershell excited Ar15+ satellite lines, including the magnetic sublevels needed for calculating the linear line polarization. We compare these calculations to the relative magnitudes of the observed 1s2s2p-->1s(2)2s transitions and find good agreement, confirming the identification of the lithiumlike 1s2s2p P-4(5/2)-->1s(2)2s S-2(1/2) magnetic quadrupole line.
引用
收藏
页码:325041 / 325047
页数:7
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