Collision-induced dissociation of CS2+ to S-2(+) at kilovolt laboratory energies

Collision-induced dissociation (CID) of CS2+ molecular ions to S-2(+) ions at laboratory collision energies ranging from 1 to 6 keV energy has been st udied by mass analyzed ion kinetic energy spectrometry (MIKES) utilizing a reversed geometry tandem mass spectrometer. The dissociation proceeds via f our energetically distinct pathways which are strongly dependent upon the k inetic energy of the ion and on the nature of the collision gas. CID with a rgon neutrals is dominated at all energies by the lowest energy threshold r eaction, which is endothermic by about 6 eV, whereas the energetics of the process differ and are strongly dependent on the ion kinetic energy when li ghter collision gases (He, H-2 and D-2) are used for collisional activation . The most probable energy transfer from kinetic to internal modes is 11 +/ - 2 eV for these collision gases. A highly endothermic channel with kinetic energy loss of similar to 41 +/- 4 eV opens up when the energy of the ions is reduced to 3 keV and less, At 1 keV ion energy, there is a small contri bution to the total CID from a highly exothermic channel (kinetic energy re lease of 47 +/- 5 eV) that is observed with all collision gases under low p ressure conditions in the collision cell.