RECENT ADVANCES IN (E,3E) AND E,(3-1)E EXPERIMENTS

The experimental advances in the study of electron impact double ioniz ation using double coincidence e,(3-1)e or triple coincidence (e,3e) t echniques are reviewed. The recent advent and extension of multianalys is and multidetection systems have allowed a second generation of(e,3e ) spectrometers to be born Their most pertinent characteristics are de scribed. Illustrative results from both e,(3-1)e and (e,3e) experiment s are discussed, showing all the promising potential of these highly d ifferential studies for the detailed investigation of the fundamentals of the double ionization process.