Shell- and subshell-resolved projectile excitation of hydrogenlike Au{sup 78+} ions in relativistic ion-atom collisions

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.052712· OSTI ID:21528656

Gumberidze, A ^[1]; Fritzsche, S ^[2]; Bosch, F; Kraemer, A; Kozhuharov, C ^[3]; Ionescu, D C ^[4]; Stachura, Z ^[5]; Surzhykov, A ^[3]; Warczak, A ^[6]; Stoehlker, Th ^[1]

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1. ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
2. Frankfurt Institute for Advanced Studies FIAS, D-60438 Frankfurt am Main (Germany)
3. GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
4. Portland House, 8 Collins Street 3000 Melbourne (Australia)
5. Institute for Nuclear Physics, 31-342 Krakow (Poland)
6. Institute of Physics, Jagiellonian University, Krakow (Poland)

The projectile excitation of high-Z ions has been investigated in relativistic ion-atoms collisions by observing the subsequent x-ray emission. The x-ray spectra from the projectile excitation have been separated from the x-ray emission following electron capture into the excited states using a novel anticoincidence technique. For the particular case of hydrogenlike Au{sup 78+} ions colliding with Ar atoms, Coulomb excitation from the ground state into the fine-structure-resolved n=2 levels as well as into levels with principal quantum number n{>=}3 has been measured with excellent statistics. The observed spectra agree well with simulated spectra that are based on Dirac's relativistic equation and the proper inclusion of the magnetic interaction into the amplitudes for projectile excitation. It is shown that a coherent inclusion of the magnetic part of the Lienard-Wiechert potential leads to the lowering of the excitation cross section by up to 35%. This effect is more pronounced for excitation into states with high angular momentum and is confirmed by our experimental data.

• OSTI ID: 21528656
• Journal Information: Physical Review. A, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevA.82.052712; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
ANTICOINCIDENCE
COULOMB EXCITATION
CROSS SECTIONS
DIRAC EQUATION
ELECTRON CAPTURE
EXCITED STATES
EXPERIMENTAL DATA
FINE STRUCTURE
GOLD IONS
INTERACTIONS
ION-ATOM COLLISIONS
POTENTIALS
RELATIVISTIC RANGE
STATISTICS
X RADIATION
X-RAY SPECTRA
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
COLLISIONS
DATA
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EXCITATION
FIELD EQUATIONS
INFORMATION
ION COLLISIONS
IONIZING RADIATIONS
IONS
MATHEMATICS
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
RADIATIONS
SPECTRA
WAVE EQUATIONS