Relativistic quantum mechanic calculation of photoionization cross-section of hydrogenic and non-hydrogenic states using analytical potentials

Rodríguez, Rafael; Gil, Juan; Rubiano, J.G.; Florido, R.; Martel, P.; Mı́nguez, E.

doi:10.1016/j.jqsrt.2004.07.001

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…At present, because of a lack of experimental and theoretical data, it is hard to determine the level of correction for the relativistic effects on the TPA cross sections. In case of above edge single photoionization, the quantum mechanics calculations for hydrogenic and non-hydrogenic states show that multi-electron correlation effects have to be considered for precise cross-sections determination 44 . Since the relativistic effects are expected to become non-negligible for mid-Z and high-Z elements, the generalized cross-section presented in Eq.…”

Section: Resultsmentioning

confidence: 99%

Establishing nonlinearity thresholds with ultraintense X-ray pulses

Szlachetko

Hoszowska

Dousse

et al. 2016

Sci Rep

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X-ray techniques have evolved over decades to become highly refined tools for a broad range of investigations. Importantly, these approaches rely on X-ray measurements that depend linearly on the number of incident X-ray photons. The advent of X-ray free electron lasers (XFELs) is opening the ability to reach extremely high photon numbers within ultrashort X-ray pulse durations and is leading to a paradigm shift in our ability to explore nonlinear X-ray signals. However, the enormous increase in X-ray peak power is a double-edged sword with new and exciting methods being developed but at the same time well-established techniques proving unreliable. Consequently, accurate knowledge about the threshold for nonlinear X-ray signals is essential. Herein we report an X-ray spectroscopic study that reveals important details on the thresholds for nonlinear X-ray interactions. By varying both the incident X-ray intensity and photon energy, we establish the regimes at which the simplest nonlinear process, two-photon X-ray absorption (TPA), can be observed. From these measurements we can extract the probability of this process as a function of photon energy and confirm both the nature and sub-femtosecond lifetime of the virtual intermediate electronic state.

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Section: Resultsmentioning

confidence: 99%

Establishing nonlinearity thresholds with ultraintense X-ray pulses

Szlachetko

Hoszowska

Dousse

et al. 2016

Sci Rep

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“…The first attempt to study the effect of plasma screening was the Debye model given by Debye and Hückel [7] in 1923. Over the years, the Debye model has been widely used for the computation of atomic or plasma properties by many people [6,[8][9][10][11][12][13][14][15][16][17]. However, it was justified only in the limit of high temperature and low density.…”

Section: Introductionmentioning

confidence: 99%

Influence of hot and dense plasmas on energy levels and oscillator strengths of ions: beryllium-like ions forZ= 26–36

Li¹,

Wu²,

Hou³

et al. 2008

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

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An approach based on the self-consistent-field multi-configuration Dirac–Fock model has been developed for the calculation of atomic structures and transition properties of ions in hot and dense plasmas. The correlation effects and the angular momentum coupling among the bound electrons are treated in a way usually employed in a normal multi-configuration Dirac–Fock method. Influence of plasma screening on transition energies and oscillator strengths is investigated by introducing a correction to the one-electron potential to account for the screening of the ionized electrons. This correction is calculated from the ionized electron micro-space distribution, which is obtained based on an average atom model for the temperature- and density-dependent average ionization of atoms in plasmas. As examples, results of beryllium isoelectronic sequence ions for Z = 26–36 demonstrate that the 2s2–[2s1/2, 2p1/2]1 and 2s2–[2s1/2, 2p3/2]1 transition energies increase with plasma density and temperature, leading to a blue-shift of these lines. The overall trend for the relative changes of the oscillator strengths of the same transitions is also presented. Comparisons between the results of the present model and those of the uniform ion sphere model are made to show the significance of the micro-space density variation of the ionized electrons on the calculated results.

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“…The bound-free spectrum is calculated making use of the cross sections calculated by using FAC code [5] which are interpolated subsequently to our photon energy mesh. They are calculated through accurate methods avoiding the semi-classical Kramer's formula which introduce high errors when evaluating non-hydrogenic states [11]. In terms of the cross sections the bound-free opacity and emissivity are evaluated as…”

Section: Optical Properties Modulementioning

confidence: 99%

Code to calculate optical properties for plasmas in a wide range of densities

et al. 2006

Self Cite

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A flexible code developed to obtain optical properties for plasmas in a wide range of densities and temperatures named ATOM3R-OP is presented. It is structured in three modules devoted to the calculation of the atomic magnitudes, the ionic abundances and the optical properties, respectively, which are briefly described. Finally, some results and remarks are shown for the source function of carbon plasmas.

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Relativistic quantum mechanic calculation of photoionization cross-section of hydrogenic and non-hydrogenic states using analytical potentials

Cited by 7 publications

References 11 publications

Establishing nonlinearity thresholds with ultraintense X-ray pulses

Establishing nonlinearity thresholds with ultraintense X-ray pulses

Influence of hot and dense plasmas on energy levels and oscillator strengths of ions: beryllium-like ions forZ= 26–36

Code to calculate optical properties for plasmas in a wide range of densities

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