DISSOCIATIVE ELECTRON-CAPTURE IN SLOW ARQ+ SF6 (Q = 6-11) COLLISIONS/

In collisions with Arq+ ions (q = 6-11) at 3-10 qkeV we produced SFn+, 2+ molecular ions, n = 1-5. Since even the singly charged SF6+ ion is unstable all collisions lead to dissociation with a large number of di ssociation channels. We observed an alternating structure in the mass spectra of the singly and doubly charged molecular ions SFn+ and SFn2. The cations SFn+ are more stable for an odd number of fluorine atoms '(n = 3, 5) and the dications SFn2+ are more stable if the number of F atoms is even (n = 2, 4).