通过单和双芯孔产生的原子阴离子的多重光剥离
Multiple photodetachment of atomic anions via single and double core-hole creation
摘要：
本文综述了原子负离子在$K$-壳层分离研究中的实验和理论进展。在实验方面，这一领域在很大程度上受益于第三代同步辐射源的技术进步。对于C $^-$、O $^-$和F $^-$离子的多次分离，最近的结果是在光子离子合并束装置PIPE获得的，该装置是位于汉堡的PETRA III同步加速器光源的束线P04处的永久终端站。除了与以前可用的相比大大增加的光子通量之外，PIPE装置对重电荷反应产物具有非凡的检测灵敏度，这允许人们研究在λ arn范围内具有极低截面的分离过程，例如，用于涉及由单个光子同时产生两个芯孔的过程。实验结果对最先进的原子理论提出了新的挑战，需要将光激发（电离）与初始核孔产生后的衰变级联过程相结合进行计算。
英文摘要：
We review the recent experimental and theoretical progress in $K$-shell detachment studies of atomic anions. On the experimental side, this field has largely benefitted from technical advances at 3rd generation synchrotron radiation sources. For multiple detachment of C$^-$, O$^-$, and F$^-$ ions, recent results were obtained at the photon-ion merged-beams setup PIPE which is a permanent end station at beamline P04 of the PETRA III synchrotron light source in Hamburg. In addition to a much increased photon flux as compared to what was available previously, the PIPE setup has an extraordinary detection sensitivity for heavy charged reaction products that allows one to study detachment processes with extremely low cross sections in the kilobarn range, e.g., for processes involving the simultaneous creation of two core-holes by a single photon. The experimental findings pose new challenges for state-of-the-art atomic theory and require calculations combining photoexcitation (ionization) with decay cascade processes that follow after initial core-hole production.
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