AVS 63rd International Symposium & Exhibition
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP3
Efficacy of Ar+ CIRD Removal of Adsorbed O from Rh(111)

Tuesday, November 8, 2016, 6:30 pm, Room Hall D

Session: Surface Science Poster Session
Presenter: Marie Turano, Loyola University Chicago
Authors: M.E. Turano, Loyola University Chicago
R.G. Farber, Loyola University Chicago
D.R. Killelea, Loyola University Chicago
Correspondent: Click to Email
Subsurface oxygen (Osub) on Rh(111) is formed via gas-phase deposition of atomic oxygen (AO). Total O coverages of over 3 ML equivalence are possible, and results in an oxygen saturated surface and Osub. In order to study the geometric and electronic effects of Osub on a surface alone requires a technique to remove the adsorbed oxygen (Oad) while retaining Osub and minimizing damage to the metal surface. Here, we present results from our development of collision-induced recombinative desorption (CIRD) of Oad from Rh(111) using Ar+ ions from a commercial sputter gun. We show that with proper selection of the Ar+ energy and electronic bias of the metal surface, Oad can be removed leaving behind a cleared Rh(111) surface still charged with Osub. We characterized the surface with a combination of structural probes (LEED, STM) and temperature programmed desorption to quantify total oxygen and Auger electron spectroscopy for the surface coverage.