Previous ultrahigh vacuum (UHV) studies, which involved the state-resolved detection of products desorbing <u>during</u> electron irradiation of multilayer films deposited on metallic substrates, have provided valuable insight into radiation-induced chemical events. Analysis of products desorbing during electron irradiation, however, may not provide a complete understanding of condensed-phase radiolysis. For example, dissociative electron attachment may produce large charged fragments that remain trapped in the film because these high-mass species do not possess sufficient kinetic energy to overcome the polarization energy of the film. Therefore, analysis of the chemical products remaining in the multilayer thin films <u>after</u> irradiation is also necessary. Following our initial post-irradiation study, research groups at Bremen (Germany), Sherbrooke (Canada), and Georgia (USA) have demonstrated that temperature programmed desorption analysis of the chemical products in the multilayer thin films following low-energy electron irradiation can provide additional information of importance with regard to understanding condensed-phase radiolysis. Following the successful implementation of two post-irradiation techniques (temperature programmed desorption and infrared reflection absorption spectroscopy), we have recently installed a new high intensity electron gun to perform electron stimulated desorption (ESD) experiments. Performing electron stimulated desorption and post-irradiation studies in a single UHV chamber using the same electron gun will be important in further exploring the dynamics of condensed phase radiolysis.

Electron stimulated desorption and post-Irradiation analysis in a single ultrahigh vacuum chamber

249th National Meeting (2015)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.