Be I isoelectronic ions embedded in hot plasma

Journal Article · Wed Mar 15 04:00:00 EST 2006 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PHYSREVE.73.0· OSTI ID:20778878

Saha, B; Fritzsche, S ^[1]

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1. Institut fuer Physik, Universitaet Kassel, Heinrich-Plett strasse 40, D-34132 Kassel (Germany)

The influence of plasma screening on the 2s{sup 2} {sup 1}S{sub 0}{yields}2s2p {sup 3}P{sub 1}{sup o} intercombination and the 2s{sup 2} {sup 1}S{sub 0}{yields}2s2p {sup 1}P{sub 1}{sup o} allowed transitions is investigated theoretically for several ions along the Be I isoelectronic sequence (C III, N IV, O V, Si XI, Fe XXIII, and Mo XXXIX). For the case of a weakly coupled hot plasma, multiconfiguration Dirac-Fock computations have been carried out for these ions by considering a (time averaged) Debye-Hueckel potential for both the 'electron-nucleus' and 'electron-electron' interaction. The plasma screening is found to enlarge the 2s{sup 2} {sup 1}S{sub 0}{yields}2s2p {sup 3}P{sub 1}{sup o} excitation energy uniformly along the Be I isoelectronic sequence, leading to an increasing blueshift of this intercombination line as the nuclear charge is increased. For the 2s{sup 2} {sup 1}S{sub 0}{yields}2s2p {sup 1}P{sub 1}{sup o} resonance line, in contrast, the transition energy is either blueshifted or redshifted in dependence of the screening parameter and owing to a cancellation of the plasma screening on the electron-nucleus and electron-electron interaction. This interplay of the (external) plasma screening with the internal interactions in the berylliumlike ions leads, for instance, to a shift of the resonance transition from red to blue in going from O V to Si XI ions. Apart from the screening effects on the transition energies, we also investigate their influence on the oscillator strengths and emission rates along the Be I isoelectronic sequence.

• OSTI ID: 20778878
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 3 Vol. 73; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BERYLLIUM IONS
CARBON IONS
ELECTRON-ELECTRON INTERACTIONS
EXCITATION
HOT PLASMA
IRON IONS
LUMINESCENCE
MOLYBDENUM IONS
NITROGEN IONS
OSCILLATOR STRENGTHS
OXYGEN IONS
PLASMA SIMULATION
RESONANCE
SILICON IONS
SPECTRAL SHIFT