Open AccessOptically driven surface reactions: Laser probes of surface dynamics
Author(s) -
Richard R. Cavanagh,
David S. King
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/623027
Subject(s) - auger electron spectroscopy , desorption , femtosecond , adsorption , photodissociation , chemistry , femtochemistry , laser , analytical chemistry (journal) , spectroscopy , thermal desorption spectroscopy , photochemistry , carbon fibers , oxygen , chemical physics , materials science , optics , organic chemistry , physics , quantum mechanics , composite number , nuclear physics , composite material
Our efforts in the past three and a half years have been directed towards providing the ground work for applying REMPI detection to the dynamics of surface oxidation and desorption reactions. Our initial efforts addressed the oxidation of carbon films that had been prepared on metal supports. The photolysis of adsorbed N{sub 2}O was chosen as the initial oxygen atom source. However, a number of alternative O atom precursors were also evaluated. Results from Auger electron spectroscopy (AES), temperature programmed desorption (TPD), and state-resolved studies of the photochemistry of N{sub 2}O, NO{sub 2}, or O{sub 2} coadsorbed with carbon on Pt(111) have been obtained. In the last eighteen months, we have focused on a stringent test of current theories of femtosecond laser-induced desorption of CO/Cu(100). The results indicate that an electronic friction model is sufficient to account for essentially all of the results in this system, indicating that a predictive tool for femtosecond laser-induced surface chemistry may be in hand