Dominance of the radiative cascades in the cross section and circular polarization of x-ray radiation

Dominance of the radiative cascades in the cross section and circular polarization of x-ray radiation
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X 射线辐射横截面和圆偏振中辐射级联的主导地位

DOI:
10.1088/0953-4075/48/24/245201
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发表时间:
2015-10
影响因子:
1.6
通讯作者:
Zeng, J. L.
Zeng, J. L.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Chen, Z. B.;Zeng, J. L.

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辐射级联通常表现为对直接撞击过程的一个较小的修正。然而,我们在这里证明,对于高电荷离子的极化电子碰撞激发,辐射级联可能发挥重要作用,可以定性地改变所发射的X射线辐射的横截面和圆极化。取1 s2(J = 0)→?>类He Fe ~(24 +)的1 s2 s ~(1/2)(J = 1)激发,?> Ge 30 +,?> Mo 40 +,?> Ag 45 +,?> #24772;,?离子为例。对于这些离子,从高位能级1 snp(n = 2,3,4,5,6)的主要级联通道将强烈地主导直接激发过程,并极大地改变Mf = −1的磁子能级截面,以及导致X射线发射模式的预期圆极化的显著变化。
The radiative cascade typically appears as a somewhat small correction to the direct impact process. We demonstrate here, however, that for the longitudinally-polarized electron impact excitation of highly charged ions, radiative cascades may play a significant role that can change the cross section and circular polarization of the emitted x-ray radiation qualitatively. This conclusion is verified by taking the 1s2 (J = 0) → ?> 1s2s1/2 (J = 1) excitation of He-like Fe 24 + , ?> Ge 30 + , ?> Mo 40 + , ?> Ag 45 + , ?> and W 72 + ?> ions as examples. For these ions, the dominant cascade channels from high-lying levels 1 snp (n = 2, 3, 4, 5, 6) will strongly dominate the direct excitation process and greatly modify the Mf = −1 magnetic sublevel cross sections, as well as leading to a considerable change in the expected circular polarizations of the x-ray emission pattern.
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发表时间: 1990-08
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