AVS 47th International Symposium
    Surface Science Wednesday Sessions
       Session SS-WeP

Paper SS-WeP3
Effects of Film Morphology on the Electron Stimulated Desorption of O@super -@ from O@sub 2@ Deposited on Benzene

Wednesday, October 4, 2000, 11:00 am, Room Exhibit Hall C & D

Session: Poster Session
Presenter: L. Parenteau, University of Sherbrooke, Canada
Authors: A.D. Bass, University of Sherbrooke, Canada
L. Parenteau, University of Sherbrooke, Canada
L. Sanche, University of Sherbrooke, Canada
Correspondent: Click to Email
Low energy electron impact techniques can be used to study thin molecular solids under ultra high vacuum (UHV) and have already provided valuable information on the electronic interactions underlying phenomena such as radiation damage to biological materials, dielectric aging and surface mediated photo-chemistry.@footnote 1@ Experiments measuring the electron stimulated desorption (ESD) of ionic and neutral fragments have been of considerable value, yet only recently have researchers considered how factors such as film porosity or morphology affect ESD measurements.@footnote 2,3@ In this article we investigate the effects of film phase and porosity on the ESD of O@super -@ from O@sub 2@ molecules deposited onto the surface of multilayer benzene. Benzene films deposited at temperatures below 30 K are amorphous@footnote 4@ and appear porous so that O@sub 2@ molecules diffuse into their surface. When benzene is deposited at temperatures near 100 K, a non-porous film is formed which severely limits the penetration of O@sub 2@ into the benzene layer. The results are compared with measurements of O@super -@ production from O@sub 2@ covered water ices.@footnote 5@ @FootnoteText@ @footnote 1@See for example L. Sanche, IEEE Trans. Dielec. Elec. Insulat. 4, 507 (1997) @footnote 2@ W.C. Simpson M.T. Sieger T.M. Orlando L. Parenteau K. Nagesha L. Sanche J. Chem. Phys., @footnote 3@ E. Vichnevetski, P. Cloutier, and L. Sanche, J. Chem. Phys. 110, 8112 (1999) @footnote 4@ P.Swiderek and H. Winterling Chem. Phys. 229, 295 (1998) @footnote 5@ R. Azria, Y. Le Coat, M. Lachgar, M. Tronc, L. Parenteau, L. Sanche, Surf. Sci. 436, L671 (1999).