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Atomic and optical properties of warm dense copper
Gennady Miloshevsky1, Ahmed Hassanein1
1Center for Materials under Extreme Environment, School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, Indiana 47907-2017, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 15, 2015
Summary
We modeled copper plasmas to understand X-ray emission from warm dense matter. Our findings show non-equilibrium effects significantly impact soft X-ray spectra, crucial for diagnostics and source development.
Area of Science:
- Plasma Physics
- Atomic Physics
- X-ray Spectroscopy
Background:
- X-ray emission from warm dense matter is key for diagnostics and intense X-ray source development.
- Understanding atomic and optical properties of dense plasmas is crucial.
Purpose of the Study:
- To model atomic and optical properties of copper plasmas using collisional-radiative steady-state (CRSS) modeling.
- To investigate the impact of temperature and density on copper plasma ionization and spectra.
- To analyze the importance of non-local thermodynamic equilibrium (non-LTE) effects on X-ray emission.
Main Methods:
- Utilized collisional-radiative steady-state (CRSS) modeling for copper plasmas.
- Validated the CRSS model against existing data for aluminum and carbon plasmas.
- Investigated plasma properties across a range of temperatures (1-100 eV) at solid density.
- Compared local thermodynamic equilibrium (LTE) and non-LTE approaches for spectral analysis.
Main Results:
- Copper plasmas at solid density exhibit unbound outer electrons even at low temperatures (~1 eV).
- Ionization states shift from fivefold to twelvefold ionization as temperature increases from 1 to 100 eV.
- Non-LTE effects are significant for K-shell soft X-ray emission, suppressing line emissivity.
- Increased plasma density causes line broadening and redshifts in K- and L-shell spectral lines.
Conclusions:
- Non-LTE effects are critical for accurate modeling of soft X-ray emission from dense copper plasmas.
- Plasma density significantly influences spectral line properties, causing broadening and redshifts.
- Results provide insights into radiative properties of warm dense copper, aiding future experimental studies and source development.
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