K-shell excitation studied for H- and He-like bismuth ions in collisions with low-Z target atoms
- Institut fuer Kernphysik, University of Frankfurt, August-Euler-Strasse 6, D-60486 Frankfurt and Gesellschaft fuer Schwerionenforschung, 64291 Darmstadt (Germany)
- Bereich Theoretische Physik, Hahn-Meitner-Institut Berlin, Glienickerstr. 100, D-14109 Berlin (Germany)
- Institut for Nuclear Studies, 05-400 Swierk (Poland)
- Gesellschaft fuer Schwerionenforschung, 64291 Darmstadt (Germany)
- Institut of Nuclear Physics, 31-342 Cracow (Poland)
- Institute of Physics, Jagiellonian University, 30-059 Cracow (Poland)
- Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The formation of excited projectile states via Coulomb excitation is investigated for hydrogenlike and heliumlike bismuth projectiles (Z=83) in relativistic ion-atom collisions. The excitation process was unambiguously identified by observing the radiative decay of the excited levels to the vacant 1s shell in coincidence with ions that did not undergo charge exchange in the reaction target. In particular, owing to the large fine-structure splitting of Bi, the excitation cross sections to the various L-shell sublevels are determined separately. The results are compared with detailed relativistic calculations, showing that both the relativistic character of the bound-state wave functions and the magnetic interaction are of considerable importance for the K-shell excitation process in high-Z ions such as Bi. The experimental data confirm the result of the complete relativistic calculations, namely, that the magnetic part of the Li{acute e}nard-Wiechert interaction leads to a significant reduction of the K-shell excitation cross section. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 567035
- Journal Information:
- Physical Review A, Vol. 57, Issue 2; Other Information: PBD: Feb 1998
- Country of Publication:
- United States
- Language:
- English
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