arXiv subjects

Dhananjay Nandi

Publications and source records attributed to Dhananjay Nandi.

21 records · Page 2Linked to original sources

arXiv2016

Dipolar dissociation dynamics in electron collisions with carbon monoxide

Dipolar dissociation processes in the electron collisions with carbon monoxide have been studied using time of flight (TOF) mass spectroscopy in combination with the highly differential velocity slice imaging (VSI) technique. Probing ion-pair states both positive and/or negative ions may be detected. The ion yield curve of negative ions provides the threshold energy for the ion-pair production. On the other hand, the kinetic energy distributions and angular distributions of the fragment anion provide detailed dynamics of the dipolar dissociation process. Two ion-pair states have been identified based on angular distribution measurements using VSI technique.

physics.atm-clus↗

arXiv2015

Clear Identification of Previously Unresolved Overlapping Resonances in Dissociative Electron Attachment: A Case Study on Chlorine Molecule

An observed broad resonance peak in dissociative electron attachment (DEA) cross sections to a molecule might be due to either closely lying or overlapping resonances involved in the process. We developed a state-of-the-art experimental approach that enables us to identify unambiguously both the closely lying and the overlapping resonances based on kinetic energy and/or angular distribution measurements of fragment negative ion(s) generated from DEA process. Experimental observations strongly supported by theoretical potential energy curve calculations unambiguously identify previously unresolved overlapping resonances in DEA to chlorine molecule.

physics.chem-ph↗

arXiv2014

Molecular Dynamics in Dissociative Electron Attachment to CO probed by Velocity Slice Imaging

Kinetic energy and angular distributions of O$^-$ ions formed by dissociative electron attachment to CO molecule have been studied for 9, 9.5, 10, 10.5, 11, 11.5 eV incident electron energies around the resonance using time sliced velocity map imaging spectrometer. Detailed observations clearly show two separate DEA reactions lead to the formation of O$^{-}$ ions in the ground $^{2}P$ state along with the neutral C atoms in ground $^{3}P$ state and first excited $^{1}D$ state, respectively. Within the axial recoil approximation and involving four partial waves, our angular distribution results clearly indicate that the two reactions leading to O$^{-}$ formation proceed through the distinct resonant state(s). For the first process, more than one intermediate states are involved. Whereas, for the second process, only one state is involved. The observed forward-backward asymmetry is explained due to the interference between the different partial waves that are involved in the processes.

physics.atm-clus↗