A metastable state in CO2++dissociating into CO++O+with a halfhyphen;life of 2.3plusmn;0.2 mgr;sec has been observed. The corresponding metastable peaks are observed at (M1/q1)*=35.6 and (M2/q2)*=11.6, respectively. The widening of these peaks with accelerating voltage shows the repulsion energy to be 2.7 eV and the corresponding charge separation at fragmentation to be 5.3 Aring;. The appearance potential of CO2++was found to be 38.0plusmn;0.2 eV, and this value is discussed in terms of the various repulsion energies and energy balances. The data is consistent with the hypothesis of an immediate fragmentation into CO+(2Sgr;) and O+and the metastable fragmentation into CO+(2IIi) and O+. The fragmentation of CO2++enriched in O18has also been reinvestigated. It is shown that the unsymmetrical doubly charged molecule ion (CO16O18++) has a lower yield than the corresponding symmetrical molecule ions containing O16and O18, respectively.
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