Atomic Physics with Accelerators: Projectile Electron Spectroscopy (APAPES)

Madesis, I.; Dimitriou, A.; Laoutaris, A.; Lagoyannis, A.; Axiotis, M.; Mertzimekis, T. J.; Andrianis, M.; Harissopulos, S.; Benis, E. P.; Sulik, B.; Valastyán, I.; Zouros, T. J. M.

doi:10.1088/1742-6596/583/1/012014

Cited by 22 publications

(11 citation statements)

References 10 publications

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“…We applied our simulations, described in Sec. IV, to one of our previously published 13 spectra that from 25.3 MeV F 7+ + H 2 , as well as to new spectra from 12.0 MeV C 4+ + Ne collisions obtained for the APAPES project 11 where the 4 P J states have even longer lifetimes. In order to obtain the solid angle correction factor G τ in simulation, we worked as follows.…”

Section: Resultsmentioning

confidence: 77%

“…In this report, we present a Monte Carlo type approach within the SIMION 8.1 6 charged particle optics simulation environment to treat the problem of the accurate determination of the solid angle correction factor for a hemispherical deflector analyzer (HDA) with injection lens 7-10 and PSD. We have been using such a spectrograph over the last decade and now turn to the determination of electron yields from excited metastable ion projectile states as in the on-going APAPES project 11 where such a correction will be crucial. Here, we re-examine and extend the existing geometrical approaches (applied to conventional slit spectrometers) to also include spectrographs with a focusing/pre-retardation entry lens.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states

Doukas

Madesis

Dimitriou

et al. 2015

Review of Scientific Instruments

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We present SIMION 8.1 Monte Carlo type simulations of the response function and detection solid angle for long lived Auger states (lifetime τ ∼ 10(-9) - 10(-5) s) recorded by a hemispherical spectrograph with injection lens and position sensitive detector used for high resolution Auger spectroscopy of ion beams. Also included in these simulations for the first time are kinematic effects particular to Auger emission from fast moving projectile ions such as line broadening and solid angle limitations allowing for a more accurate and realistic line shape modeling. Our results are found to be in excellent agreement with measured electron line shapes of both long lived 1s2s2p(4)P and prompt Auger projectile states formed by electron capture in collisions of 25.3 MeV F(7+) with H2 and 12.0 MeV C(4+) with Ne recorded at 0° to the beam direction. These results are important for the accurate evaluation of the 1s2s2p (4)P/(2)P ratio of K-Auger cross sections whose observed non-statistical production by electron capture into He-like ions, recently a field of interesting interpretations, awaits further resolution.

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Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states

Doukas

Madesis

Dimitriou

et al. 2015

Review of Scientific Instruments

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“…We focused our study on usual operating conditions of our spectrometer corresponding to deceleration factors F = 4 and F = 8. The experimental setup simulated is presently located at the 5 MV tandem accelerator facility of the NCSR Demokritos in Athens, Greece [26], for which the length of the gas cell is L c ¼ 50 mm, the distance of the center of the gas cell from the lens entry is s 0 ¼ 289 mm and the radius of the lens entry aperture is r ¼ 2 mm. For clarity the V p s axis is plotted in log scale.…”

Section: The Correction Factor G Smentioning

confidence: 99%

Evaluation of the effective solid angle of a hemispherical deflector analyser with injection lens for metastable Auger projectile states

Benis

Doukas

Zouros

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…This interest has been generated to a large extent in the fields of thermonuclear fusion, hot plasmas, astrophysics, accelerator technology and basic physics of ion-atom collision dynamics. Our recent APAPES 1 initiative allows for the first investigations of accelerator-based atomic physics in Greece, using the newly completed and now fully operational, innovative electron spectroscopy apparatus 2,3 . Here, we present the basics of the technique, as well as some of our first results on our investigations of electron capture from gas targets using 12 MeV C 4+ ion beams obtained from the negative ion sputter source of the TANDEM and produced using the newly installed terminal gas stripper.…”

Section: Introductionmentioning

confidence: 99%

Zero-degree Auger Projectile Electron Spectroscopy of Li-like Ions obtained in Collisions of 1s2s 3S He-like Ions with Gaseous Targets

Madesis

Laoutaris

Benis

et al. 2019

hnps

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An experimental station has recently been completed with a beam line dedicated to atomic collision physics at the 5.5 MV TANDEM accelerator laboratory of the Institute of Nuclear and Particle Physics (INPP) at the National Center for Scientific Research (NCSR) “Demokritos” in Athens. A Zero-degree Auger Projectile Spectroscopy (ZAPS) apparatus composed of a single-stage Hemispherical Deflector Analyser (HDA) and a 2-dimensional Position Sensitive Detector (PSD), combined with a doubly differentially pumped gas target has been set up for high resolution studies of electrons emitted from projectile ions at θ = 0◦ with respect to the beam direction in collisions with dilute gas targets. A terminal gas stripper, as well as both a foil and a gas post-stripper, have also been newly installed, enhancing the capabilities of the TANDEM by allowing for the production of more intense, highly charged ion beams, thus complementing and expanding the range of the available energies and charge states of the TANDEM. Using this setup, a systematic isoelectronic investigation of high resolution K-Auger electron spectra emitted from pre-excited ions in collisions with gas targets has been commenced within the APAPES initiative. Here, we present some highlights of this program together with recent results. This investigation is expected to lead to a better understanding of electron capture to excited states of the ion beam and in particular the overlooked role of cascade feeding of metastable states contributing to the capture cross sections, recently a field of contested interpretations awaiting further resolution.

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Atomic Physics with Accelerators: Projectile Electron Spectroscopy (APAPES)

Cited by 22 publications

References 10 publications

Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states

Determination of the solid angle and response function of a hemispherical spectrograph with injection lens for Auger electrons emitted from long lived projectile states

Evaluation of the effective solid angle of a hemispherical deflector analyser with injection lens for metastable Auger projectile states

Zero-degree Auger Projectile Electron Spectroscopy of Li-like Ions obtained in Collisions of 1s2s 3S He-like Ions with Gaseous Targets

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