Precision studies of deep-inner-shell photoabsorption by atomic ions

Precision studies of deep-inner-shell photoabsorption by atomic ions
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原子离子深内壳光吸收的精密研究

DOI:
10.1088/0031-8949/90/5/054004
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发表时间:
2015
期刊:
影响因子:
2.9
通讯作者:
A. Müller
A. Müller
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
A. Müller

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本文重点介绍了单光子吸收介导的k -壳电离和k -壳激发,综述了原子离子深层内壳光吸收的实验研究现状。对于不涉及k壳层的内壳过程,只考虑超过约350ev的光子能量。讨论了光吸收和随后的弛豫机制以及光电离和光复合之间的关系。第三代同步加速器光源的高光子能量分辨率为精确测量跃迁能量提供了新的可能性。这对于研究少电子系统的k -壳层激发是特别有趣的。通过使用原子离子作为目标,无论是以准直光束的形式还是被困在电磁场中,都有可能在涉及光发射或俄歇过程中K空位衰变的跃迁光谱中达到高水平的精度。给出了绝对截面测量和精密光谱学的实例。
With emphasis on K-shell ionization and K-shell excitation mediated by the absorption of a single photon the present paper provides an overview of the status of experiments in which deep-inner-shell photoabsorption by atomic ions has been investigated. For inner-shell processes not involving the K-shell only photon energies beyond about 350 eV are considered. Mechanisms of photoabsorption and subsequent relaxation as well as relations between photoionization and photorecombination are discussed. New possibilities for precise measurements of transition energies have been provided by the high photon-energy resolution available at 3rd generation synchrotron light sources. This is particularly interesting for studies of K-shell excitation of few-electron systems. By using atomic ions as targets, either in form of a collimated beam or trapped in electromagnetic fields, it has been possible to reach a high level of precision in the spectroscopy of transitions involving the decay of K vacancies by photoemission or Auger processes. Examples for absolute cross section measurements and precision spectroscopy are presented.
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