Dense plasma opacity from excited states method

Area of Science:

• Plasma Physics
• Stellar Astrophysics
• Computational Physics

Background:

• Opacity calculations are crucial for stellar modeling.
• Plasma effects in opacity become non-perturbative at high densities.
• Existing models may not fully capture self-consistent plasma electron behavior.

Purpose of the Study:

• To develop and apply a new model for calculating oxygen plasma opacities under solar interior conditions.
• To investigate the impact of self-consistent electron treatment on opacity.
• To explore the influence of free electron energy and entropy variations.

Main Methods:

• Utilized a recently published model for self-consistent plasma effects.
• Calculated opacities for oxygen plasmas at relevant densities and temperatures.
• Compared results with a state-of-the-art model lacking self-consistent electron treatment.

Main Results:

• The new model demonstrates a significant increase in bound-free opacity.
• Opacities increased by up to 10% compared to models without self-consistent electron effects.
• The treatment of free electrons alongside bound electrons is critical for accuracy.

Conclusions:

• Self-consistent inclusion of plasma effects is essential for accurate opacity calculations.
• The developed model provides a more realistic representation of oxygen plasma opacity.
• Findings impact stellar interior models and astrophysical simulations.