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Be I isoelectronic ions embedded in hot plasma.
1Institut für Physik, Universität Kassel, Heinrich-Plett strasse 40, D-34132 Kassel, Germany. saha@quanta.synchem.kyoto-u.ac.jp
Summary
Plasma screening significantly affects atomic transitions in beryllium-like ions. The intercombination line blueshifts uniformly with increasing nuclear charge, while the resonance line
Area of Science:
- Atomic Physics
- Plasma Physics
- Quantum Chemistry
Background:
- Plasma screening effects are crucial for understanding atomic spectra in hot, dense environments.
- Beryllium-like ions exhibit complex electronic transitions influenced by external plasma conditions.
Purpose of the Study:
- Investigate the impact of plasma screening on specific transitions in beryllium-like ions.
- Analyze how screening affects excitation energies, oscillator strengths, and emission rates.
Main Methods:
- Utilized multiconfiguration Dirac-Fock computations.
- Employed a time-averaged Debye-Hückel potential for electron-nucleus and electron-electron interactions.
- Studied ions along the C III to Mo XXXIX isoelectronic sequence.
Main Results:
- Plasma screening uniformly enlarges the excitation energy of the 2s(2 1)S0-->2s2p(3)p(0)1 intercombination line, causing a blueshift with increased nuclear charge.
- The 2s(2 1)S0-->2s2p(1)p(0)1 resonance line exhibits blueshift or redshift depending on the screening parameter due to competing interactions.
- Observed a transition from red to blue shift for the resonance line between O V and Si XI ions.
Conclusions:
- Plasma screening plays a critical role in determining spectral line shifts in beryllium-like ions.
- The interplay between external plasma screening and internal atomic interactions leads to varied transition energy shifts.
- Screening effects on oscillator strengths and emission rates were also analyzed for these ions.