Doubly ionized OCS bond rearrangement upon fragmentation – experiment and theory

Abstract

The dissociation of OCS2+ ions formed by photoionization of the neutral molecule at 40.81 eV is examined using threefold and fourfold electron-ion coincidence spectroscopy combined with high level quantum chemical...

Excitation and ionization of OCS molecules in strong UV and NIR laser fields

“…Actually, recent studies indicate that a third of the OCS 2+ ions produced in strong laser fields are unstable and finally dissociate to fragment ions. [32] The fact that the yields of S * are much higher than those of OC * strongly indicates that the electrons are recaptured by the atomic fragment ions S + rather than by the diatomic fragment ions OC + from Coulomb explosion of OCS 2+ . This could be understood by the orientationdependent ionization of OCS molecules in strong laser fields.…”

“…Carbonyl sulfide (OCS) is important in the global cycling of sulfur and has been discovered in the atmosphere, volcanic gases, ice cores in Antarctica and the interstellar medium. Photo-ionization/dissociation of OCS, which plays a pivotal role in various light-induced chemical and physical processes involving the molecule, has been widely investigated using synchrotron radiation, [31][32][33] ion impact [34,35] and intense lasers. [36] With regard to strong femtosecond laser pulses, the Coulomb explosion of OCS has been investigated using ion-momentum imaging and the structure of the exploding molecule has been retrieved, the results of which have proved the occurrence of molecular bending during enhanced ionization.…”