Development and Application of Velocity Slice Imaging Spectrometer to Study Low-energy Electron-molecule Collisions

Nag, Pamir (2017) Development and Application of Velocity Slice Imaging Spectrometer to Study Low-energy Electron-molecule Collisions. PhD thesis, Indian Institute of Science Education and Research Kolkata.

PDF (PhD thesis of Pamir Nag (11IP18)) Pamir_Nag_PhD_Thesis.pdf - Submitted Version Restricted to Repository staff only Download (7MB)

Abstract

A time sliced velocity map imaging spectrometer has been developed and successfully used to study the negative ions produced from neutral molecules in gas phase due to low-energy electron impact. Dissociative electron attachment (DEA) is a two step resonant process, resulting into a final anionic and a neutral fragments, occurs due to low-energy electron collisions with primary beam energy starting from 0 eV upto around 15 eV. Whereas, dipolar dissociation starts around above 15 eV and continues upto few hundreds of eV incident electron energy and produces an anionic and a cationic fragments. The differential DEA cross-section, kinetic energy distribution as well as angular distribution of the fragment anions have been studied using the spectrometer. Detailed studies about the formation of anions due to DEA to Cl₂ and CO molecule and dipolar dissociation of O2 molecule have been presented in the thesis.

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