Dissociation dynamics of low energy electron attachment to carbon disulfide studied using velocity slice imaging technique

Dissociative electron attachment (DEA) to carbon disulfide (CS₂) is investigated using the well-known velocity slice imaging technique. Previous reports indicate that DEA to CS₂ leads to three different fragment anions, S^-, CS^-, and S₂^-, at two different resonances around 3.8 eV and 6.2 eV energy [1,2]. It is documented that the symmetry of these two resonant states is ∑_g and ∑_u, respectively [3]. However, no experimental studies are available to understand the dissociation dynamics involved in the 3.8 eV resonance. In the present study, the velocity slice images of S^- ions are recorded at different electron energies over the 3.8 eV resonance. The kinetic energy distribution of the fragment S^- ions is extracted from the velocity slice images. A locked kinetic energy behavior with increasing incident electron energy is observed. In order to understand the dissociation dynamics involved in the process, the angular distribution of the S^- ions with respect to the incident electron beam are measured. Our measurements indicate that the ∑_g symmetry negative ion resonant state is present near 3.8 eV. The complete dissociation dynamics is studied with the assistance of quantum chemical calculations, which I will discuss at the conference. [1] E. Krishnakumar and K. Nagesha J. Phys. B: Atom. Mol. Opt. Phys. 25, 1645-1660 (1992). [2] A. Paul, D. Nandi, Phys. Chem. Chem. Phys. 24, 21020-21029 (2022). [3] K. Nagesha, B. Bapat, V. Marathe and E. Krishnakumar, Z. Phys. D: At., Mol. Clusters. 41, 261-266 (1997).