MEAN LIFETIMES AND KINETIC ENERGY RELEASED UPON DISSOCIATION OF 3He4He2+ AND 12C16O2+ MOLECULAR IONS I. Ben-Itzhak*, Z. Chen*, C.D. Lin*, J.P. Bouhnik#, I. Gertner#, B. Rosner#, Z. Amitay?, O. Heber?, and D. Zajfman? *J.R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506 USA #Department of Physics, Technion, Haifa, 32000, Israel ?Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel We present measurements of the mean lifetime and the kinetic energy released upon dissociation of 3He4He2+ and CO2+. The simultaneous measurement was accomplished by three-dimensional imaging of the dissociating fragments about 1 ms after their formation in fast charge stripping collisions. Calculations of tunneling rates and rovibrational energies of the electronic ground state of 3He4He2+ were conducted using the phase shift method. The measured values for this molecular ion are in agreement with the calculated values for the n=1 and l=15 state.