Absolute Auger rates, relative intensities and angular distribution of the KLL spectra of Auger electrons from alkali atoms
Absolute Auger rates, relative intensities and angular distribution of the KLL spectra of Auger electrons from alkali atoms
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碱原子俄歇电子 KLL 谱的绝对俄歇速率、相对强度和角分布
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
S. Fritzsche
中科院分区：
文献类型：
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作者：
B. Lohmann;S. Fritzsche
本文计算了碱金属原子Na、K、Rb和Cs的KLL俄歇谱的俄歇电子绝对速率、相对强度和角各向异性系数。在闭壳层原子中，KLL俄歇线必须是各向同性的，这对于开壳层系统中的某些俄歇跃迁不再有效。首次采用中间耦合方案计算了开壳层原子的角各向异性系数。俄歇矩阵元的计算采用包含Breit-QED和交换作用的相对论多组态Dirac-Fock模型。俄歇速率和强度的结果进行了比较与早期的理论预测和实验数据。角各向异性参数进行了讨论，在LS耦合的理论预测。所有碱金属原子的KL_1 L_（2.3）俄歇跃迁都具有较大的角各向异性系数。特别是，一个可观察到的角各向异性可以预测的俄歇跃迁钾。
The absolute Auger rates, relative intensities and the angular anisotropy coefficients of Auger electrons have been calculated for the KLL Auger spectra of the alkali atoms Na, K, Rb, and Cs. Where in closed-shell atoms the KLL Auger lines have to be isotropic, this is no longer valid for certain Auger transitions in open-shell systems. The angular anisotropy coefficients are calculated for open-shell atoms for the first time applying an intermediate coupling scheme. The relativistic multiconfigurational Dirac-Fock model including Breit-QED and exchange interaction is used for the calculation of the Auger matrix elements. The results for the Auger rates and intensities are compared with earlier theoretical predictions and experimental data. The angular anisotropy parameters are discussed together with theoretical predictions in the LS coupling. Large angular anisotropy coefficients have been found for the KL1L2.3 Auger transitions of all alkali atoms. In particular, an observable angular anisotropy can be predicted for the Auger transitions of potassium.