High-resolution spectroscopy of laser-produced L-shell molybdenum plasma

Area of Science:

• Plasma Physics
• Atomic Spectroscopy
• Laser-Induced Breakdown Spectroscopy (LIBS)

Background:

• Spectroscopic methods are crucial for diagnosing laser-produced plasmas.
• High-resolution emission line spectroscopy, combined with atomic calculations and hydrodynamic simulations, offers powerful diagnostic capabilities.

Purpose of the Study:

• To present line-resolved spectra of L-shell molybdenum plasma.
• To identify specific ionic species and their spectral lines.
• To determine plasma parameters like electron density and temperature.

Main Methods:

• Laser-produced plasma generation using high-energy laser pulses (200-400 J, 351 nm, 1-3 ns).
• High-resolution crystal spectroscopy (E/ΔE>400) for time-integrated spectral recording (2-4.1 keV).
• Collisional-radiative calculations using HULLAC and nomad codes for spectral analysis.

Main Results:

• Identification of spectral lines from Al-like Mo^{+29} to F-like Mo^{+33}.
• Dominance of intense Ne-like Mo^{+32} lines observed in the spectra.
• Agreement between experimental results and collisional-radiative calculations.
• Estimated electron density (n_{e}=0.6-3×10^{21}cm^{-3}) and electron temperature (kT_{e}=1.1-1.3keV) from the coronal plasma region.

Conclusions:

• The study successfully characterized the emission spectra of laser-produced molybdenum plasma.
• The combination of experimental spectroscopy and theoretical calculations provides accurate plasma diagnostics.
• The identified spectral features and derived plasma parameters are valuable for understanding high-energy-density plasma physics.