Role of cascade and Auger effects in the enhanced population of the C{sup 3+}(1s2s2p {sup 4}P) states following single-electron capture in C{sup 4+}(1s2s {sup 3}S)-He collisions

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.042701· OSTI ID:21408617

Roehrbein, D; Kirchner, T; Fritzsche, S ^[1]

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1. Institut fuer Theoretische Physik, Technische Universitaet Clausthal, D-38678 Clausthal-Zellerfeld (Germany)

The population of excited three-electron states in carbon ions after single-electron capture in 0.5-1.1 MeV/amu C{sup 4+}(1s2s {sup 3}S)-He collisions is analyzed theoretically by combining different methods. While the two-center basis generator method is used to calculate capture amplitudes on the single-particle level, all-electron structure calculations for the relevant C{sup 3+} states and their radiative and Auger transition rates are performed on the multiconfiguration Dirac-Fock level. These data are then combined and fed into a set of classical rate equations for the decay dynamics. Total cross sections for the production of the 1s2s2p {sup 4}P, 1s2s2p {sup 2}P{sub -}, and 1s2s2p {sup 2}P{sub +} states are calculated and their ratios compared with recent experimental data and previous calculations [D. Strohschein et al., Phys. Rev. A 77, 022706 (2008)]. It is found that the relative intensities of the 1s2s2p {sup 4}P states are considerably larger than expected on the basis of pure spin statistics. The Auger transitions, which were not included in the previous calculations, have a significant effect on the final results in that they reduce the 1s2s2p {sup 2}P intensities. Although our extended computations explain a significant part of the production of the 1s2s2p {sup 4}P states, the experimentally observed enhancement of these states is still considerably larger than the theoretical one.

• OSTI ID: 21408617
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
ANGULAR MOMENTUM
CALCULATION METHODS
CAPTURE
CARBON IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DECAY
ELECTRON CAPTURE
ELECTRONIC STRUCTURE
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
IONS
KINETICS
LEPTONS
PARTICLE PROPERTIES
REACTION KINETICS
SPIN
TOTAL CROSS SECTIONS