Cascade decays of hollow ions

Omar, Gaber; Hahn, Yukap

doi:10.1103/physreva.43.4695

Cited by 30 publications

(13 citation statements)

References 9 publications

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“…The specific case is the cascades in the hollow atoms, created in collision processes be-tween highly charged ions and solid surfaces or other targets [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the cascades in atoms using the global characteristics of spectra

Karazija¹,

Kučas²,

Jonauskas³

2004

Lith. J. Phys.

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Dedicated to the 100th anniversary of Professor A. JucysFollowing the creation of inner-shell vacancy in an atom, the cascade of radiative and nonradiative transitions takes place. It can be analysed employing the final charge distribution of ions, the electron and characteristic emission spectra. The development of the experimental and theoretical investigation of cascades is shortly reviewed. The main attention is paid to the description of a cascade using the global characteristics of spectra, especially in the cases of transitions between close-lying and overlapping configurations. Some applications of the global characteristics method are given.

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“…The specific case is the cascades in the hollow atoms, created in collision processes be-tween highly charged ions and solid surfaces or other targets [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the cascades in atoms using the global characteristics of spectra

Karazija¹,

Kučas²,

Jonauskas³

2004

Lith. J. Phys.

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“…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. The maximum charge predicted was 6, with the peak population at Z f = 4, while the experiment showed significant production of ions with Z f = 6 and 7.…”

Section: Introductionmentioning

confidence: 77%

“…The model was then applied to study the final charge state distribution (FCSD) of the photoionized Ne + and Mg +, with excellent agreement with experiment in the former case. The discrepancy found in the earlier calculation [2,3] without the shake-off (SKOF) effect was thus removed. The old model (RAC) without the SKOF treated only the decaying part of the process, and required a correction at the level of 5%-10%.…”

Section: Introductionmentioning

confidence: 96%

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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“…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: 93%

“…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%

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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Cascade decays of hollow ions

Cited by 30 publications

References 9 publications

Investigation of the cascades in atoms using the global characteristics of spectra

Investigation of the cascades in atoms using the global characteristics of spectra

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

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

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