Molecular dynamics simulations of temperature equilibration in dense hydrogen

Area of Science:

• Plasma Physics
• Computational Physics
• Condensed Matter Physics

Background:

• Accurate modeling of electron-proton temperature equilibration is crucial for understanding dense plasmas.
• Existing theoretical models require validation against simulation data in dense hydrogen.

Purpose of the Study:

• To calculate the temperature equilibration rate between electrons and protons in dense hydrogen.
• To compare simulation results with theoretical models like Gericke-Murillo-Schlanges (GMS) and Landau-Spitzer.

Main Methods:

• Molecular dynamics simulations were employed.
• Simulations covered temperatures from 10 to 600 eV and densities from 10^20 to 10^24 cm^-3.
• Careful attention was paid to simulation convergence and semiclassical potentials.

Main Results:

• The Gericke-Murillo-Schlanges (GMS) model and the Brown-Preston-Singleton approach agree with simulation data for Coulomb logarithms L >= 1.
• The GMS model is consistent with simulation results for smaller Coulomb logarithms.
• Landau-Spitzer models align with simulation data for L > 4.

Conclusions:

• The GMS model provides a reliable prediction for electron-proton temperature equilibration in dense hydrogen across various conditions.
• Simulation results validate specific theoretical models within defined ranges of the Coulomb logarithm.
• This study refines our understanding of energy transfer mechanisms in dense plasmas.