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

Abstract

Complete dissociation dynamics of low-energy electron attachment to carbon disulfide have been studied using the velocity slice imaging (VSI) technique. The ion yields of the different fragment anions produced due...

Dissociation dynamics of ion-pair states accessed by low-energy electron collisions

“…One possible explanation could be that the excess energy is distributed as the internal excitation (rovibrational excitation) of the neutral conjugate (CO), which was not possible for the dissociation of a diatomic molecule like CO and O 2 . This type of excess energy redistribution was also found in low-energy DEA to triatomic and other polyatomic molecules [31,62]. From the variation of most probable kinetic energy with the incident electron energy, the authors found that the ion kinetic energy first increases with the increasing electron energy and then gets locked.…”

“…The schematic of a simple VMI spectrometer is shown in figure 1(b). This is one of the most advanced systems for electron-molecule collision studies and is widely used by several groups [28,31,40]. The basic procedure in the experiment entails the interaction of an electron beam and a molecular beam, where one of them is in pulsed mode.…”

“…This warrants the importance of the electron collision technique further. In the most recent study on the IPD of O 2 by Kundu et al [35], the authors used a wedge-sliced technique [31,61]. They found the involvement of quintet Rydberg states with the dissociative pathways of the superexcited states.…”

“…Using the VSI technique, one can simultaneously measure the kinetic energy and angular distribution of the fragment ions produced from the dissociation process, which eventually helps to understand the dynamics involved in the electron-molecule collision processes. Nowadays, the VSI technique has been employed extensively over the years by several groups to study the dynamics of DEA [29][30][31][32]. However, as the focus of these studies was on the DEA process, the usual approach adopted by the scientific community was that of neglecting the IPD process.…”

Interaction of low-energy electrons with radiosensitizers

“…At energies above 4 eV, DEA is proceeding via core excited resonances of the CS bond in a mechanism similar to CS 2 . 131 The most intense DEA channels opening at this energy are leading to S − and (TU-S) − . However, the ion yield of the second most intense decomposition product of the molecule SCN − is slightly shifted towards lower energy, which can be a result of the contribution from the high π* shape resonance to this DEA channel.…”