Fragmentation processes of OCS in collision with highly charged ions

Fragmentation of (OCS)³⁺ and (OCS)⁴⁺ produced by 120 keV Ar⁸⁺ collision was studied by using a position-sensitive time-of-flight (PS-TOF) method. We identified stepwise processes involving CO²⁺ and CS²⁺ metastable species as well as the concerted process (simultaneous breakup of the two bonds). For the (OCS)⁴⁺ events, the stepwise processes were found for fragmentation channels containing a doubly-charged terminal atom.