Interaction of Multicharged Ions with Molecules (CO2,C60) by Coincident Electron Spectroscopy

Abstract

First results for the investigation of electron capture processes in collisions between multicharged ions and molecule targets using electron spectroscopy in coincidence with charged fragments, are presented. It is shown that a much more detailed investigation of the capture reaction can be achieved using molecular instead of heavy atomic targets provided that an analysis of the target dissociation is made. The collisional systems 18O8+ + Ar, CO2 and C60 have been studied at 80 keV. Non coincident electron spectra as well as first results of double or triple coincidence experiments are discussed. Kinetic energy distributions of the Cn+ fragments (n = 1 to 8) produced in multiple capture processes from C60 target are given. A detailed investigation of the double capture process with CO2 molecule allows the measurement of kinetic energy release distributions (KERD) which characterize the dissociation of CO22+ molecular ions; our results are found to be very similar to those measured in double photoionisation experiments.