2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203367Simple analytic formulae for energy relaxation (ER) in electron-ion systems, with quantum corrections, ion dynamics and RPA-type screening are presented. ER in the presence of bound electrons is examined in view of of recent simulations for ER in hydrogen in the range 10^{20}-10^{24} electrons/cc.4 two-column style pages, two figuresPlasma PhysicsAstrophysicsStatistical MechanicsGeneral Physicstext