AVS 56th International Symposium & Exhibition
    Surface Science Tuesday Sessions
       Session SS1+PS+TF+AS+NS-TuA

Paper SS1+PS+TF+AS+NS-TuA11
Condensed Phase Electron-Stimulated Reactions: Desorbed Anions and Retained Radicals

Tuesday, November 10, 2009, 5:20 pm, Room C1

Session: Non-Thermal Chemistry / Ion, Electron Processes
Presenter: Y. Shyur, Wellesley College
Authors: Y. Shyur, Wellesley College
J. Wang, Wellesley College
S. Lau, Wellesley College
E. Krupczak, Wellesley College
C. Arumainayagam, Wellesley College
Correspondent: Click to Email
Studies of low-energy electron-induced processes in nanoscale thin films serve to elucidate the pivotal role that low-energy electron-induced reactions play in high-energy radiation-induced chemical reactions in condensed matter. While electron-stimulated desorption (ESD) experiments conducted during irradiation have yielded vital information relevant to primary or initial electron-induced processes, analyzing the products following low-energy electron irradiation can provide new insights into radiation chemistry. We have used post-irradiation temperature-programmed desorption to identify labile radiolysis products as demonstrated by the first identification of methoxymethanol as a reaction product of methanol (CH3OH) radiolysis. Although low-energy electron-induced oligomerization reactions have been previously reported for molecules such as thiophene and cyclopropane, our electon-induced studies of CCl4 represent the first study to specifically identify the products of such reactions, demonstrating the utility of post–irradiation temperature programmed desorption experiments to study the radiation chemistry of condensed matter. Results of post-irradiation studies have been used not only to determine the identity of radiolysis products, but also to determine the dynamics of electron-induced reactions. By comparing our post-irradiation results to previous electron stimulated desorption studies of anion production during irradiation of condensed CF2Cl2 and CF3I, we examine the relationship between desorbed anions and retained radicals during dissociative electron attachment in the condensed phase.