Triple coincidence experiments to study the fragmentation of core ionized molecules by electron impact

An apparatus to study the fragmentation of molecular dications following inner shell ionization by electron impact has been built at CNR-IMAI. The fragmentation of the dications is studied via Auger electron-ion-ion coincidence experiments. This coincidence technique has been used to identify N 1s -1v -1->v -3 transitions in the N 2 Auger spectrum and to study the fragmentation of CH 4 2+ after C 1s ionization. © 2002 Published by Elsevier Science B.V.