Differential electron scattering from positive ions measured by zero-degree ion-atom spectroscopy
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Ημερομηνία
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peer reviewed
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Όνομα περιοδικού
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
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Περιγραφή
Recent developments in quasi-free electron scattering from highly charged ions are reported. Results using a high-efficiency zero-degree Auger projectile spectroscopy setup are presented primarily for collisions of H- and He-like boron beams with H, targets. A novel technique for the in situ control and determination of the metastable 1s2s(3)S beam fraction of He-like boron allowed for an accurate determination of absolute double differential scattering cross sections for 180degrees resonant and non-resonant electron scattering from both ground-(1s(2)) and mixed-(1s(2), 1s2s (3)S) B(3+) states. The observed richly structured B(2+) (1s 2l nl') Rydberg series is produced by resonant excitation (RE) from the 1s(2) ground state, while the triply excited B(2+) (2s 2l '2l") hollow ionic states are produced by RE from the 1s 2s (3)S metastable state. The consistency of the method was checked by quasi-free electron scattering from H-like B(4+) ions giving rise to the 2l nl' Rydberg series. Differential R-matrix calculations within the electron scattering model for electron-ion scattering from both H-like and ground state He-like boron were found to be in excellent overall agreement. The production of triply excited (2s 2l' 2l") states by RE was also studied for the Z = 5-9 isoelectronic sequence. These results convincingly demonstrate that large-angle differential scattering cross section measurements, practically impossible to perform with present day crossed or merged electron-ion beam techniques, are amenable to measurement through high resolution electron spectroscopy of ion-atom collisions, providing some of the most sensitive tests of atomic structure and electron-ion scattering calculations. (C) 2003 Elsevier Science B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
electron-ion scattering, quasi-free electron scattering, highly charged ions, hci, zero-degree auger projectile spectroscopy, resonant excitation, he-like ions, r-matrix calculation, resonant transfer excitation, multiply-charged ions, elastic-scattering, cross-sections, dielectronic-recombination, hemispherical analyzer, 2-d psd, inelastic-scattering, angular-distribution, collisions
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Σύνδεσμος
<Go to ISI>://000183211200098
http://ac.els-cdn.com/S0168583X03005305/1-s2.0-S0168583X03005305-main.pdf?_tid=75893ed4-4de8-11e3-bc51-00000aacb360&acdnat=1384514835_eed7d4c33ca55412600185356aa9f291
http://ac.els-cdn.com/S0168583X03005305/1-s2.0-S0168583X03005305-main.pdf?_tid=75893ed4-4de8-11e3-bc51-00000aacb360&acdnat=1384514835_eed7d4c33ca55412600185356aa9f291
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en
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Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών