[en] Several newly observed electron-ion collision phenomena that occur in high temperature plasmas containing electrons and ions of energies 10 to 10₄ eV, or temperature of 10₅ to 10₈K, are reviewed. These are the phenomena of dielectronic recombination, excitation-autoionization, and electron energy-loss scattering as measured in crossed (90⁰) and merged electron-ion beam experiments