A theoretical and experimental investigation of the formation of S-2 from CS2 by electron impact

Abstract

Theoretical and experimental investigation of the formation of S − 2 from CS 2 by electron impact has been carried out. Molecular orbital calculations show that some of the low lying states of CS − 2 have lower potential energy in the bent geometries suggesting a transformation in the geometric structure of the precursor molecular ion, leading to the formation of S − 2 . In contrast to the formation of S − and CS − , the kinetic energy associated with S − 2 is small and disproportionate to the increase in electron energy, indicating the formation of S − 2 in vibrationally excited states due to the mechanism of its formation.

Dissociative electron attachment dynamics of carbon disulfide and violation of axial recoil approximation near 6 eV resonance

“…If the CS fragment is in its electronic ground state then, E* = 0. Inserting the CS-S bond dissociation energy, D(CS-S) = 4.66 eV 16 and electron affinity of S, A(S) = 2.08 eV 18 in eqn (1), we get the estimated threshold value for the production of S À as 2.58 eV. On the other hand, the first electronic excitation energy of the CS radical is 4.82 eV.…”

“…With the electron affinity of CS, A(CS) = 1.66 eV 18 the estimated threshold for the production of CS À becomes 3.0 eV. The velocity slice images of S À ions are taken at six different incident electron energies (5.7, 6.2, 6.7, 7.2, 7.7, and 8.7 eV) around these two resonances and shown in Fig.…”

“…With the electron affinity of S 2 , A(S 2 ) = 1.66 eV, 18 and bond dissociation energy of S 2 , D(S-S) = 4.4 eV, 18 the estimated threshold for the production of CS À becomes 3.26 eV.…”

“…Nagesha et al gave theoretical insight into the production of S 2 À ions from the DEA to CS 2 . 18 Most of the previous theoretical studies on electron scattering with CS 2 are restricted to the calculation of the differential and total elastic electron scattering crosssection using different theoretical models. [6][7][8]11,12 None of these studies have conclusively assigned the symmetry of the symmetry are involved in the 3.6 eV and 6.2 eV resonance, respectively.…”

“…[6][7][8]11,12 None of these studies have conclusively assigned the symmetry of the symmetry are involved in the 3.6 eV and 6.2 eV resonance, respectively. 18 They gave a theoretical insight into the production of the S 2 À ions due to the bending of the TNI at 6.2 eV resonance. On the other hand, the angular distribution of different fragment anions is not present to date.…”