Structure of partially ionized warm aluminum plasma and screened electron-ion interaction

• Main Authors: Rajai, C. S., Gohil, D. R., Bhatt, N. K., Vyas, P. R.
• Format: Conference Proceeding
• Language: English
• Subjects: Aluminum; Approximation; Dense plasmas; Density; Distribution functions; Electron states; Free electrons; Interaction parameters; Mathematical models; Plasma; Structure factor
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0052504

We report analytical results for pair distribution function g(r) and structure factor S(q) for warm dense partially ionized aluminum plasma at metallic density employing a numerical scheme going beyond one component plasma (OCP) model. It is built on the effective charged hard sphere (e-CHS) based two-parameter model; packing fraction (η) and ion plasma parameter (Γ), but simplified to convert into a one-parameter scheme. Ion interaction through electron screening effect is determined within the linear response theory for dielectric function and a description beyond the random phase approximation (RPA) is incorporated through the local field correction. We employ a local pseudopotential comprises of a Hartree potential, exchange-correlation potential based on the local density approximation and a repulsive delta-function to achieve the orthogonalization effect of free electron states to the core states. Results for g(r) and S(q) are fitted to experimental and recent ab initio simulations findings to deduce effective charge in warm Al- plasma. We examine our scheme for temperature ranging from melting 0.08 eV up to 15 eV. Fitted parameters are compared and analyzed with quantum two component plasma (Q-TCP) model parameters. Good agreement with Q-TCP compared to OCP is discussed, which exemplifies the importance of proper account for exchange and correlation effect. The proposed scheme is further tested for some important thermodynamic quantities and results so deduced are validated with reported findings. Overall agreement for computed physical quantities confirms the need of screened electron-ion interaction and a scheme going beyond the OCP model for accurate determination for structure and thermodynamics of dense plasma.