Photoionization of Excited and Ionized Systems

Wuilleumier, F. J.; West, John B.

doi:10.1007/978-1-4613-0315-2_16

Cited by 9 publications

(8 citation statements)

References 144 publications

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“…This technique allows absolute cross sections down to 0.1 Mb to be measured. A detailed description of the experimental methods used for free atomic ions and the results obtained are given in several review articles [128,123,129].…”

Section: Experiments With Free Ionsmentioning

confidence: 99%

Open shells and multi-electron interactions: core level photoionization of the 3d metal atoms

Martins

Godehusen²,

Richter

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

114

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This review covers the outer core level photoionization of the free 3d metal atoms from Sc to Cu. The experimental 3p, 3s and 2p photoemission and photoabsorption spectra are discussed. A comparison emphasizes common features and distinct differences. The interpretation of the data based on ab initio calculations reveals the influence of multi-electron interactions in the 3d metal atoms. We focus on the fundamental effects and main interactions which govern the electronic structure of these open shell atoms.

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Section: Experiments With Free Ionsmentioning

confidence: 99%

Open shells and multi-electron interactions: core level photoionization of the 3d metal atoms

Martins

Godehusen²,

Richter

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

114

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“…PACS numbers: 32.80.Fb, 32.80.Hd, 52.25.Qt The response of positive ions to ionizing radiation, the fundamental process of photoionization, is a dominant process in the universe. However, it is largely unexplored experimentally due to the difficulty of producing and maintaining appropriate densities of multiply charged ions, along with the requirement for high-flux sources in the extreme UV and x-ray ranges [1,2]. Photoionization is particularly attractive for theoretical interpretation due to (i) selectivity, owing to dipole selection rules, (ii) the fact that the photon disappears, thereby simplifying the final state, and (iii) the weak coupling between the photon and target electrons, allowing focus on the many-body aspects of the electron-electron interactions of the target ion [3][4][5].…”

mentioning

confidence: 99%

Anomalous Behavior of the Near-Threshold Photoionization Cross Section of the Neon Isoelectronic Sequence: A Combined Experimental and Theoretical Study

et al. 1999

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We present a combined theoretical and experimental investigation of photoionization along the Ne isoelectronic sequence and show that the near-threshold behavior of the cross section for Si 41 differs radically from the nearby ions in the sequence. We demonstrate that the general nature of the underlying physics implies that dramatic changes in near-threshold behavior may be expected for many other ions. PACS numbers: 32.80.Fb, 32.80.Hd, 52.25.Qt The response of positive ions to ionizing radiation, the fundamental process of photoionization, is a dominant process in the universe. However, it is largely unexplored experimentally due to the difficulty of producing and maintaining appropriate densities of multiply charged ions, along with the requirement for high-flux sources in the extreme UV and x-ray ranges [1,2]. Photoionization is particularly attractive for theoretical interpretation due to (i) selectivity, owing to dipole selection rules, (ii) the fact that the photon disappears, thereby simplifying the final state, and (iii) the weak coupling between the photon and target electrons, allowing focus on the many-body aspects of the electron-electron interactions of the target ion [3][4][5].From a fundamental point of view, positive ions provide a "laboratory" to investigate the dynamic interplay between many-body electron-electron correlations, electron-nucleus interactions, and relativistic effects by looking along an ionic sequence. With increasing ionization, as the electron-nucleus interactions dominate, the photoionization behavior will tend towards hydrogenic; however, this trend towards simplicity is not at all monotonic, and very significant changes in the cross section behavior may occur for particular ions. In this Letter, we report the first combined theoretical and experimental investigation of photoionization along the Ne isoelectronic sequence and show that the near-threshold behavior of the cross section for Si 41 differs radically from the nearby ions in the sequence. We demonstrate that the general nature of the underlying physics implies that dramatic changes in near-threshold behavior may be expected for many other ions.Photoionization of the Ne isoelectronic sequence, aside from its importance as the response of the simplest noble gas structure with multiple shells ͑1s 2 2s 2 2p 6 ͒ to ionizing radiation, is also of particular interest owing to the significant cosmic abundance of Ne, Na . Furthermore, the study of photoionization provides information on the inverse processes of radiative and dielectronic recombination which are of importance in modeling astrophysical [7] and laboratory [8] plasmas, particularly for low-energy electrons corresponding to the near-threshold region, which is the focus of this Letter.Following the pioneering work of Codling et al. [9], several extensive experimental investigations on neutral Ne have been carried out, aided by the relative simplicity of working with a gas and recent developments in storage ring sources [10]. For ions of the Ne sequence, previo...

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“…The limitations introduced by dipole selection rules into the accessibility from the ground state to a complete class of excited states can be circumvented. The study of photoionization of atoms from excited states is already 25 years old, as described in detail in previous reviews [30][31][32], but new techniques make it now a more tractable research endeavour than the huge effort required at the beginning to obtain the first data on excited atoms.…”

Section: General Interestmentioning

confidence: 99%

Pump–probe experiments in atoms involving laser and synchrotron radiation: an overview

Wuilleumier¹,

Meyer²

2006

J. Phys. B: At. Mol. Opt. Phys.

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The combined use of laser and synchrotron radiations for atomic photoionization studies started in the early 1980s. The strong potential of these pump–probe experiments to gain information on excited atomic states is illustrated through some exemplary studies. The first series of experiments carried out with the early synchrotron sources, from 1960 to about 1995, are reviewed, including photoionization of unpolarized and polarized excited atoms, and time-resolved laser–synchrotron studies. With the most advanced generation of synchrotron sources, a whole new class of pump–probe experiments benefiting from the high brightness of the new synchrotron beams has been developed since 1996. A detailed review of these studies as well as possible future applications of pump–probe experiments using third generation synchrotron sources and free electron lasers is presented.

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Photoionization of Excited and Ionized Systems

Cited by 9 publications

References 144 publications

Open shells and multi-electron interactions: core level photoionization of the 3d metal atoms

Open shells and multi-electron interactions: core level photoionization of the 3d metal atoms

Anomalous Behavior of the Near-Threshold Photoionization Cross Section of the Neon Isoelectronic Sequence: A Combined Experimental and Theoretical Study

Pump–probe experiments in atoms involving laser and synchrotron radiation: an overview

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