Demarcating the Classical and Quantum Approaches for the Coulomb Logarithm in Plasmas
Kodanova S.K. Ramazanov T.S. Issanova M.K.
October 2025John Wiley and Sons Inc
Contributions to Plasma Physics
2025#65Issue 8-9
The Coulomb logarithm often enters various plasma models and simulation methods for computing the transport and relaxation properties of plasmas. Traditionally, a classical pair collision picture was used to calculate the Coulomb logarithm for different plasma parameters. With the recent emergence of the high interest in dense plasmas with partially degenerate electrons, new approaches have been developed to treat electron-ion collisions in a quantum-mechanical way. In this context, gaining a deeper physical understanding of the criteria for the applicability of classical plasma models is crucial. We have analyzed the Coulomb logarithm describing the electron-ion collisions in hydrogen plasmas in a wide range of temperatures and densities relevant to inertial confinement fusion experiments. The electron-ion collision cross-sections were computed using both quantum and classical scattering theories. We found that the classical description of the electron-ion scattering in plasmas and related plasma models is applicable if the de Broglie wavelength of electrons is smaller than the ion charge screening length in plasmas. Additionally, we show that the quantum first-order Born approximation for describing the electron-ion collision is accurate only in the regime where classical scattering theory is accurate.
classical and quantum approaches , coulomb logarithm , dense plasma , electron-ion collisions , transport cross-sections
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Institute of Applied Sciences and IT, Almaty, Kazakhstan
Institute for Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Kazakh Physical Society, Almaty, Kazakhstan
Institute of Applied Sciences and IT
Institute for Experimental and Theoretical Physics
Kazakh Physical Society
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