Photo-Auger-ionization and charge-state distribution

Omar, Gaber; Hahn, Yukap

doi:10.1103/physreva.44.483

Cited by 26 publications

(10 citation statements)

References 13 publications

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“…We then predict the FCSD for Mg. The case of Ar ions with one or more inner-shell holes is very complex, as already seen in [6] even without the SKOF effect, and we report the result of the improved calculation in detail in a separate report. The surprising result of this study is that the higher charge states seen in the experiment Nat not predicted by the RAC were in fact produced during the production of the hole and not during the RAC decay.…”

Section: Introductionmentioning

confidence: 70%

“…The detailed calculation showed that the resulting FCSD was similar to that found in experiments (for Ne, Mg and Ar) but the theoretical result was somewhat skewed toward the lower charge states. The simple RAC model (as used in [5] and [6]) failed to predict the higher charge state component of the FCSD. The overall effect was at the 10-20% level, but for some high charge states, the theory grossly underestimated the distribution.…”

Section: Introductionmentioning

confidence: 98%

“…The distribution of the final charge states reflects the dynamical characteristic of the system with one or more inner-shell holes. We studied this problem [5,6] in terms of a simple radiative-Auger-cascade (RAC) model, in which it was assumed that the decay of a system with inner-shell holes proceeds purely by X-ray emissions or by Auger electron emissions, in cascade. The detailed calculation showed that the resulting FCSD was similar to that found in experiments (for Ne, Mg and Ar) but the theoretical result was somewhat skewed toward the lower charge states.…”

Section: Introductionmentioning

confidence: 99%

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Shake-off effects on the production and decay of hollow ions

Omar

Hahn

1992

Z Phys D - Atoms, Molecules and Clusters

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Atoms, MoleculesZeiischrift a n d C l u s t e r s fflr Physi k D © Springer-Verlag 1992 Shake-off effects on the production and decay Abstract. An improved form of the radiative-Auger-cascade model is presented in which the shake-off contribution is incorporated into the model in a mathematically consistent way, avoiding the problem of double counting. The higher charge state distribution found in the photoionization experiment of the 1 s electron in Ne is shown to be predominantly due to the shake-off effect during the formation of the 1 s hole, and not during the cascade decays as previously assumed. This shake-off contribution is estimated in the sudden approximation, in terms of overlaps between the neutral and singly ionized ions. An excellent agreement with experiment is obtained in the case of Ne + with 1 s hole. The details of the X-ray and Auger spectra are also predicted by the new model both for the Ne and Mg ions. The shake-off effect on the resonant processes in general is discussed.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Shake-off effects on the production and decay of hollow ions

Omar

Hahn

1992

Z Phys D - Atoms, Molecules and Clusters

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“…1(b)-1. Theoretically, the decay channels have been identified and described as the radiative Auger cascade [9]. Most of the L-shell vacancy production is indirect, that is it results from K Auger or K x-ray emission rather than direct L-shell ionization.…”

Section: Methodsmentioning

confidence: 99%

Ne, Ar, Fe, and Cu Auger-electron production at National Synchrotron Light Source

Lee

Johnson

Guardala

et al. 1993

Nuclear Instruments and Methods in Physics Research Section B:

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“…In order to mainly clarify the discrepancy in the earlier calculation of the FCSD in Ar, but also to test the theory in complex systems, we apply the RACS to the Ar ions. This problem was treated earlier [5] using the simple RAC model without the SKOF effect. As in the Ne and Mg case [2], the earlier RAC theory without the SKOF again predicted FCSD which was skewed toward the lower charge states, and failed to give sufficient population of higher charge states.…”

Section: Introductionmentioning

confidence: 99%

Final charge state distribution in the production and decay of hollow Ar

Omar

Hahn

1992

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The improved model of radiative-Auger-cascade with shake-off effect is applied to calculate the final charge state distribution and the X-ray and Auger electron spectra emitted during the cascade decay of At, with the initial ls hole created by the synchrotron irradiation. The discrepancy in the predicted charge distribution without the shake-off effect is removed. It was found that the discrepancy was caused mainly by the neglect of the shake-off effect during the productin stage of the 1 s hole, and not by the shake-off effect during the decay of the 1 s hole. The X-ray and Auger spectra predicted by the improved model are compared with that without the shakeoff. The charge distributions resulting from a 2s or 2p initial hole are also presented.

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Photo-Auger-ionization and charge-state distribution

Cited by 26 publications

References 13 publications

Shake-off effects on the production and decay of hollow ions

Shake-off effects on the production and decay of hollow ions

Ne, Ar, Fe, and Cu Auger-electron production at National Synchrotron Light Source

Final charge state distribution in the production and decay of hollow Ar

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