7月24日 Theoretical and Computational Aspects of Dielectronic Recombination

报告题目：Theoretical and Computational Aspects of Dielectronic Recombination

报告时间：2026年07月24日（星期五）9:00-10:00

报告地点：四号楼 五楼中间会议室

主 持 人：张凌

报 告 人：Darío M. Mitnik 教授

Professor, Instituto de Astronomía y Física del Espacio, CONICET-UBA, Buenos Aires, Argentina

Visiting Professor, Institute of Plasma Physics Chinese Academy of Sciences

His research focuses on computational atomic physics, including quantum methods for collision processes, electron-impact excitation, and atomic data calculations for plasma spectroscopy applications. His group has extensive and well-established experience in atomic and molecular physics, with contributions to the development of advanced computational methods for atomic and molecular collision problems and their applications in plasma spectroscopy.

报告简介：Dielectronic Recombination (DR) is a key resonant process for plasma ionization balance. This work presents its theoretical formulation, computational methods, and the main physical effects that modify the standard rates.

The DR process is described as a two-step mechanism: resonant capture of a free electron into a doubly-excited state, followed by radiative stabilization. The theoretical framework is based on perturbation theory, with rate coefficients calculated from autoionization and radiative probabilities using atomic structure codes.

Special attention is given to cases that deviate from the standard model, including:

• Non-Maxwellian electron distributions.
• Electric and magnetic field effects.
• Interference between RR and DR.
• Configuration Interaction (CI) effects.
• Relativistic effects.
• Density effects.

Finally, results from two specific projects are summarized: a general DR benchmark study (The DR Project), and an application to Tungsten for fusion plasma research (The Tungsten Project).