Electron-ion and ion-ion collisions with intersecting beams

摘要: Publisher Summary This chapter investigates electron–ion and ion–ion collisions with intersecting beams. The “signals” from or reactions can be masked by “backgrounds” due to much more frequent between the beams residual gas, but sophisticated beam-modulation techniques have been devised extract signals backgrounds even when they are three four orders of magnitude larger. In hot, thin plasmas ionization equilibrium is primarily determined balance electron-impact dielectronic recombination. Both processes investigated colliding Inner-shell effects occur for a wide variety ions sometimes their threshold close that outer-shell ionization. important in because it usually overlap high-energy “tail” plasma electron distribution near-threshold cross section determines rate. Moreover, investigation highly charged reveals systematic trends isoelectronic sequences provides direct information about encountered very hot laboratory stellar atmospheres.