Dielectronic Recombination of W 45+ and W 44+ : Configuration Mixing - PowerPoint PPT Presentation

IAEA & KAERI Joint CM Dielectronic Recombination of W 45+ and W 44+ : Configuration Mixing and Channels Duck-Hee Kwon and Wonwook Lee Nuclear Data Center Korea Atomic Energy Research Institute KAERI, Korea 14-16 Sept. 2015

Contents 1. Introduction 2. DR Cross Section & Rate coefficient 3. Results & Discussion 4. Summary & Outlook Nuclear Data Center Atomic & Molecular Lab. O

Introduction  DR cross sections and rate coefficients have been calculated for W 45+ and W 44+ based on an IPIR-DW approximation using flexible atom code (fac).  Effects of configuration mixing (CM) involving double electron core excitation and non-resonant stabilizations + decay to autoionizing levels possibly followed by cascades (DAC) on DR are investigated. Nuclear Data Center Atomic & Molecular Lab. O

Introduction Dielectronic recombination 6 5 4 3 2 1 0 W W2+ W4+ W6+ W8+ W10+ W12+ W14+ W16+ W18+ W20+ W22+ W24+ W26+ W28+ W30+ W32+ W34+ W36+ W38+ W40+ W42+ W44+ W46+ W48+ W50+ W52+ W54+ W56+ W58+ W60+ W62+ W64+ W66+ W68+ W70+ W72+ W74+ Experimental data is available only for these ions. Nuclear Data Center Atomic & Molecular Lab. O

Introduction Nuclear Data Center Atomic & Molecular Lab. O

DR cross section and rate coefficient     * * *            q ( q 1 ) ( q 1 ) e A A A h . i j f Nuclear Data Center Atomic & Molecular Lab. O

Calculated energies for W 45+ and W 44+ Excellent agreement with the recommanded NIST data (0.001 ~ 0.5 %) Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 3d+e - → 4l4 l’ (CM & NRS+DAC) Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 3d+e - → 4l4 l’ (CM & NRS+DAC) Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 3p+e - → 4l4 l’ (CM & NRS+DAC) Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 3p+e - → 4l4 l’ (CM & NRS+DAC) Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 3d → 4l core excitation rate coeff. Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 3p → 4l core excitation rate coeff. Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 4s → 4l core excitation Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : 4s → 5l core excitation Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : Total Rate Coefficient Submitted. Nuclear Data Center Atomic & Molecular Lab. O

W 45+ : Total Rate Coefficient Nuclear Data Center Atomic & Molecular Lab. O

Resonance profile (dense states)  j →  sp =10 eV Nuclear Data Center Atomic & Molecular Lab. O

W 45+ :Resonance profile (dense states) Nuclear Data Center Atomic & Molecular Lab. O

W 44+ : 4s → 4l core excitation Nuclear Data Center Atomic & Molecular Lab. O

DR computation challenges  Long running time for branching ratio calculation due to so many resonance levels or NRS+DAC consideration as more CM is considered or ion stage with complex configuration structure is treated.  Parallel algorithms are needed for the AI or RD transition rate calculation. Nuclear Data Center Atomic & Molecular Lab. O

Summary & Outlook  Our calculated energies for W 45+ and W 44+ are in excellent agreement with the recommended NIST data. (0.001 ~ 0.5 %)  CM affects on DR rate coefficient significantly specially at low energies near threshold due to appearance of new resonances or resonance energy shift.  Accurate DR rate coefficient of W 45+ counting all contributable resonances was provided.  Density effect , GCR and state resolved DR are our future works. Nuclear Data Center Atomic & Molecular Lab. O