  Dissociative electron attachment (DEA) to gas-phase carbonyl sulfide (OCS)
has been studied diligently using the time-of-flight (TOF) based
state-of-the-art velocity map imaging (VMI) technique. Three well-resolved DEA
resonances are observed at 5.0, 6.5 and 10.0 eV incident electron energies
along with a weak structure at 8.0 eV. The velocity slice images (VSI), Kinetic
energy (KE) and angular distributions (AD) for the fragmented sulfur anions are
obtained using the wedge slicing technique. The KE distributions for the sulfur
nascent fragments reveal bi-modality with rovibrational signatures. The ADs
substantiate speed-dependent angular anisotropy demand the existence of partial
correlations among three different point group symmetries, confirmed through an
in-plane bending mode of vibration with the axial recoil breakdown. Theoretical
calculations using R-matrix and density functional approaches strongly support
the experimental observations.
