Three-body fragmentation of multiply charged nitrous oxide induced by Ar8+- and Xe15+-ion impact
AbstractWe study multiple ionization and subsequent dissociation of nitrous oxide (N2O) in collisions with 1 a.u. Ar8+ and Xe15+ ions. The experiments are performed by using a recoil ion momentum spectrometer (RIMS) equipped with a position- and time-sensitive detector which allows the measurement of the momenta of fragment ions in coincidence. By measuring the momentum vectors of the recoiling fragment ions various important parameters, such as kinetic energy release and those related to molecular structure prior to fragmentation, have been derived. Furthermore, the projectile-charge-state dependence of the fragmentation dynamics of N2O is investigated and a very mild dependence has been noticed in a few channels. In addition, we also study the concerted and sequential mechanisms in the three-body decay of N2Oq+ (where q≤7). It has been observed that N2Oq+ breaks up mainly in a concerted manner except for the N2O3+→N++N++O+ (1,1,1) and N2O4+→N2++N++O+ (2,1,1) channels. For both these channels, the presence of an intermediate rotating NO2+ has been identified. Furthermore, by using Dalitz plot analysis, we have been able to separate various mutually mixed channels of highly charged N2Oq+.