Ground state transitions in one- and two-electron Bi projectiles

doi:10.1016/0375-9601(92)91133-C

Physics Letters A

Volume 168, Issue 4, 31 August 1992, Pages 285-290

https://doi.org/10.1016/0375-9601(92)91133-C Get rights and content

Abstract

By using segmented solid state X-ray detectors and applying X-ray/charge-state selective particle coincidences, the ionic structures of ₈₃Bi⁸²⁺ and ₈₃Bi⁸¹⁺ have been studied separately at 82 MeV/u under single collision conditions. The high granularity of the Ge(i) X-ray detectors used allowed a partial Doppler correction for the X-ray events while maintaining a large total solid angle. An absoluute precision of K-transition energies of 10⁻³ is feasible; the relative accuracy is better than 30 eV. The experimental values compare very well with the theoretical transition energies in H- and He-like Bi ions.

References (12)

W.R. Johnson et al.
At. Data Nucl. Data Tables
(1985)
S.J. Brodsky et al.
P. Indelicato
R. Marrus et al.
Adv. At. Mol. Phys.
(1978)
H. Gould
P.H. Mokler
Phys. Scr.
(1987)

There are more references available in the full text version of this article.

Cited by (30)

Quantum electrodynamical effects in heavy highly-charged ions
2003, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Citation Excerpt :
For the discussion of other QED effects in heavy atoms (in particular, for the hyperfine splitting in H- and Li-like ions, and for the Lamb shift in He-like ions) we refer the reader to the recent review [1]. The Lamb shift in heavy H-like ions has been intensively studied at SIS/ESR facilities in GSI during the last decade [2–6]. The best accuracy in experiments of this kind was achieved in the measurement of the ground-state Lamb shift in H-like uranium [5,6] and is about several units per cent.
The present status of theoretical calculations of QED effects in highly charged ions is reviewed for several important cases: the Lamb shift in heavy H-like ions, the 2p_1/2–2s transition energy in heavy Li-like ions, and the bound-electron g factor in H-like ions. Theoretical predictions are compared with experimental results. Special attention is paid to the discussion of uncertainties of theoretical predictions.
Interference between electric and magnetic amplitudes for K shell excitation of high-Z H-like projectiles
1998, Physics Letters, Section A: General, Atomic and Solid State Physics
We report an investigation of projectile K shell excitation for high-Z ions in relativistic ion-atom collisions. For the case of H-like Bi, the excitation process is unambiguously identified by observing the radiative decay of the excited levels to the vacant 1s shell, in coincidence with ions that did not undergo any charge exchange in the reaction target. The results are compared with detailed relativistic calculations, showing that the magnetic interaction is of considerable importance for the K shell excitation process in high-Z ions. For excitation to the L shell sublevels, the experimental data confirm that the magnetic part of the Liénard-Wiechert interaction must be added coherently with the electric part leading to a significant reduction of the K shell excitation cross section.
QED corrections in heavy atoms
1998, Physics Report
The comparison of theory and experiment for energy levels of strongly bound electrons provides a critical test of quantum electrodynamics in strong fields. A theoretical evaluation of the vacuum polarization and self energy radiative corrections to electron binding energies in heavy atoms is given. The calculations are done to all orders in the strength of the external field of the nucleus Zα. The influence of nuclear size and structure effects is investigated. The results for the Lamb shift are compared to the experimental data.
Projectile excitation and ionization in relativistic ion-atom collisions
1997, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
K-shell ionization and excitation is studied for high-Z one-and two-electron ions in relativistic encounters with low-Z targets. For ionization, the data obtained for solid and gaseous targets are compared in detail with the predictions of first order perturbation theory. On the basis of the most recent experimental results, the systematic deviation from first order perturbation theory as observed recently for high-Z ions cannot be confirmed. Moreover, special emphasis is given to a dedicated experiment where projectile excitation has been studied in encounters of heavy one-and two-electron bismuth ions (Z = 83) with light solid targets. The measurement of the characteristic ground-state transitions in coincidence with the primary charge state allowed us to study the formation of excited projectile states via direct Coulomb excitation. In particular, due to the large fine-structure splitting, the excitation cross-sections for the various L-shell sublevels in H- and He-like bismuth could be determined separately. The results are compared with detailed relativistic calculations showing that for high-Z projectiles the magnetic interaction is of considerable importance at the considered collision energies.
The Physics of Highly Charged Heavy Ions Revealed by Storage/Cooler Rings
1996, Advances in Atomic, Molecular and Optical Physics
This chapter presents an overview of the current advances in the rapidly developing field of heavy ion accelerator technology. Now, essential aspects in this area are accessible. In the meantime, great progress already has been made in the fundamental physics in this field. This is particularly true for achievements in the atomic physics of highly charged heavy ions. There are two general domains to be considered in the atomic physics of highly charged heavy ions: the fields of collisions and of atomic structure. Both aspects have to be explored equally because they are strongly interconnected. The interaction processes has to be investigated to know, for instance, the population of excited states to help answer questions on the atomic structure; conversely, the structure has to be known to understand the interactions. In both the fields, fundamental principles can be studied uniquely. This is in particular true for the heaviest ion species with only a few- or even zero-electrons left.
Energy-loss differences of alpha particles in ferromagnetic and paramagnetic solids
1994, Nuclear Inst. and Methods in Physics Research, B

View all citing articles on Scopus

¹: Permanent address: Institute for Nuclear Studies, 05-400 Swierk, Poland.

²: Permanent address: Kansas State University, Manhattan, KS, USA.

View full text

Ground state transitions in one- and two-electron Bi projectiles

Abstract

At. Data Nucl. Data Tables

Adv. At. Mol. Phys.

Phys. Scr.