Resonant Transfer and Excitation Associated with Auger Electron Emission

Zouros, T. J. M.

doi:10.1007/978-1-4615-3470-9_22

Cited by 12 publications

(10 citation statements)

References 62 publications

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“…1 for 9 MeV, two spectra were recorded, each with a different 1s2s 3 S metastable fraction, as evidenced by the distinct intensities of the 1s2s2p 4 P peaks [25]. Indeed, the 4 P state is populated almost exclusively by SEC to the 1s2s 3 S state due to spin considerations [32], while the 1s2p 2 2 D state is mainly produced by transfer excitation (TE) [33] from the 1s 2 ground state [20,25,34], in this range of impact energies. The rest of the observed KLL states can be populated from both the ground state 1s 2 by TE and the metastable state by SEC [20,25,32,34].…”

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confidence: 99%

Pauli Shielding and Breakdown of Spin Statistics in Multielectron Multi-Open-Shell Dynamical Atomic Systems

et al. 2020

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We report on state-resolved cross sections of electron capture in collisions of swift C 4+ (1s2s 3 S) ions with helium and hydrogen. The study focuses on the formation of doubly-excited triply-openshell C 3+ (1s2s2p) 4 P and 2 P± states with emphasis on the ratio R of their cross sections as a measure of spin statistics. Using zero-degree Auger projectile spectroscopy and a three-electron close-coupling semiclassical approach, we resolve a long-standing puzzle and controversy on the value of R and on the effect of cascades, to clarify the underlying physics. The present results invalidate the frozen core approximation generally used in the past when considering electron capture in multi-electron, multi-open-shell quantum systems. A distinctive screening effect due to the Pauli exclusion principle (Pauli shielding

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confidence: 99%

Pauli Shielding and Breakdown of Spin Statistics in Multielectron Multi-Open-Shell Dynamical Atomic Systems

et al. 2020

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“…including projectile Excitation (eeE) [1 .23). Ionisation (eel) and RTE (24) as well as Binary Encounter electron production [13.25.26). The IA is valid when Vo » \)1>…”

Section: • Theory: Pwba and Impulse Approximationmentioning

confidence: 99%

Excitation and Ionization In Fast Ion-Atom Collisions Due to Projectile — Electron — Target — Electron Interactions

Zouros

1995

Application of Particle and Laser Beams in Materials Technology

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ABSTRACf. Recent investigations of excitation and ionisation in collisions of fast highly-charged projectiles with H2 and He targets have shown that effects due to projectile-electron -targetelectron interactions can be clearly identified. The interacting electrons, traditionally assigned only a passive screening role, are now seen to acquire a new dynamic role, contributing a significant part of the excitation cross section, measuring up to 60%, as in the case of K-shell projectile ionisation at collision energies of a few Me V lu. Experimental signatures for these dynamic, twocentre e-e interactions can be found in the observation of excitation thresholds, resonances and electron exchange processes, traditionally associated with excitation of ions by free electrons.Improved applications of the Born and Impulse Approximations have been successful in accounting for the new data. A brief account of these investigations is presented.

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“…has been successfully used in high resolution projectile electron spectroscopy investigations, as for example in single [23][24][25] and double [26] electron transfer, excitation [27], transfer-excitation [14,[28][29][30][31], the production of triply-excited states [32] and superelastic scattering [33,34]. In addition, long-lived 1s2s 3 S states, have also been used in a variety of other atomic physics investigations including the study of electron impact ionization [35,36], tokamak high energy charge-exchange [37] and edge impurities [38], electron capture and excitation [39], slow collisions of quasi symmetric heavy systems [40], beam-two-foil spectroscopy [41] and even two-electron quantum entanglement [42].…”

Section: Introductionmentioning

confidence: 99%

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

Benis¹,

Madesis²,

Laoutaris³

et al. 2018

Preprint

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The use of mixed-state ionic beams in collision dynamics investigations is examined. Using high resolution Auger projectile spectroscopy involving He-like ($1s^2\thinspace^1\!S, 1s2s\thinspace^{3,1}\!S$) mixed-state beams, the spectrum contributions of the $1s2s\thinspace^3\!S$ metastable beam component is effectively separated and clearly identified. This is performed with a technique that exploits two independent spectrum measurements under the same collision conditions, but with ions having quite different metastable fractions, judiciously selected by varying the ion beam charge-stripping conditions. Details of the technique are presented together with characteristic examples. In collisions of 4 MeV B$^{3+}$ with H$_2$ targets, the Auger electron spectrum of the separated $1s2s\thinspace^{3}S$ boron beam component allows for a detailed analysis of the formation of the $1s2s(^3\!S)nl \thinspace^2\!L$ states by direct $nl$ transfer. In addition, the production of hollow $2s2p\thinspace^{1,3}\!P$ doubly- and $2s2p^2\thinspace^2\!D$ triply-excited states, by direct excitation and transfer-excitation processes, respectively, can also be independently studied. In similar mixed-state beam collisions of 15 MeV C$^{4+}$ with H$_2$, He, Ne and Ar targets, the contributions of the $1s^2$, $1s2s\thinspace^{3,1}S$ beam components to the formation of the $2s2p\thinspace^{3,1}\!P$ states by double-excitation, $1s\rightarrow2p$ excitation and transfer-loss processes can be clearly identified, facilitating comparisons with theoretical calculations.

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Resonant Transfer and Excitation Associated with Auger Electron Emission

Cited by 12 publications

References 62 publications

Pauli Shielding and Breakdown of Spin Statistics in Multielectron Multi-Open-Shell Dynamical Atomic Systems

Pauli Shielding and Breakdown of Spin Statistics in Multielectron Multi-Open-Shell Dynamical Atomic Systems

Excitation and Ionization In Fast Ion-Atom Collisions Due to Projectile — Electron — Target — Electron Interactions

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

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