Off-campus UNL users: To download campus access dissertations, please use the following link to log into our proxy server with your NU ID and password. When you are done browsing please remember to return to this page and log out.
Non-UNL users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
Dissociative attachment in chloromethane, dichloromethane, chloroform and carbon tetrachloride
Abstract
This dissertation presents an electron beam study of the dissociative attachment process in the chloromethanes. A novel design of a high sensitivity ion counting system was incorporated in this work. Each chloromethane displays two peaks in the dissociative attachment cross section below an electron energy of 1 eV, with the first peak consistently at zero energy and the second peak ranging from 0.27 to 0.80 eV. A systematic increase of the dissociative attachment cross sections is observed each time a $Cl$ atom replaces an $H$ atom. The ratio of the cross sections near zero electron energy between the highest and lowest attachers, namely $CCl\sb4$ and $CH\sb{3}Cl$ respectively, is approximately six orders of magnitude, consistent with the earlier swarm measurements. Also included in this dissertation is the application of the dissociative attachment process to study gas-surface vibrational energy exchange. In this work, cool gas was allowed to flow through a heated tube and then intercepted by the electron beam at right angles. $N\sb{2}O$ was used in this study because its dissociative attachment cross section is very sensitive to temperature, permitting us to use it as a diagnostic tool for the measurement of vibrational temperature.
Subject Area
Molecules
Recommended Citation
Chu, Shi-Chung, "Dissociative attachment in chloromethane, dichloromethane, chloroform and carbon tetrachloride" (1989). ETD collection for University of Nebraska-Lincoln. AAI9019560.
https://digitalcommons.unl.edu/dissertations/AAI9019560