The dissociative ionization of CO2 by fast heavy ions

The time–energy spectroscopy (TES) technique has been used to study the dissociative ionization of CO2 induced by bombardment with 1 MeV H+, He+, and O+ ions. Fragments observed in the dissociation process include C+, O+, CO+, C2+, and O2+. The technique used permits separation and identification of the different fragment species, and measurement of a kinetic energy spectrum for each species. The kinetic energy spectra and relative intensities of the different fragments are reported. The O+ ions constitute more than half of the total charged fragment yield. The C+ and CO+ yields are nearly equal and the yield of doubly charged ions is small. The energy spectra and yields are compared to electron impact and neutral helium impact dissociation studies. The O+ and CO+ data suggest that the channel (CO2)2+→CO++O++6.0 eV is a major contributor to the observed spectra.