Low Energy Electron-Molecule Collision and Instrumentation for Velocity Map Imaging Experiment

Kumari, Komal (2015) Low Energy Electron-Molecule Collision and Instrumentation for Velocity Map Imaging Experiment. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Komal Kumari (10MS26)) Komal_10MS26_MSThesis.pdf - Submitted Version Restricted to Repository staff only Download (5MB)

Abstract

The goal of this thesis is to study the electron-molecule collision in gas phase with the help of Velocity Map Imaging (VMI) spectrometer. Our main focus is to measure simultaneously angular distribution and kinetic energy distribution of the fragments (negative ions) produced in the electron-collision process with the help of Velocity Map Imaging technique. VMI is a superior technique that takes advantages of using two- dimensional position sensitive detector. We are using a crossed beam electron-molecule collision experiment. The molecular beam is produced through a capillary. Nearly mono-energetic (magnetically collimated) electron beam, produced by an electron gun, is made to interact perpendicularly with the molecular beam under single collision condition. After that the ions are projected on two dimensional (2D) detector and then angular and kinetic energy distribution is studied. Here we are analyzing the kinetic and angular distribution analysis for low energy electron-CO2 and intermediate energy electron-O2 collision.

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