AVS 47th International Symposium
    Surface Science Wednesday Sessions
       Session SS2+VT-WeA

Paper SS2+VT-WeA10
Adsorption of Propylene on Clean and Oxygen Covered Au(111) and Au(100)

Wednesday, October 4, 2000, 5:00 pm, Room 209

Session: Adsorption and Desorption Phenomena I
Presenter: K.A. Davis, Texas A&M University
Authors: K.A. Davis, Texas A&M University
D.W. Goodman, Texas A&M University
Correspondent: Click to Email
The adsorption of propene on Au(111) and Au(100) was investigated using temperature programmed desorption (TPD) and high resolution energy loss spectroscopy (HREELS). A desorption activation energy of 9.4 kcal/mol and very small (< 25 cm@sup -1@) shifts of the vibrational frequencies from their gas phase values indicate that the interaction of propene with the surface is weak. Energy loss spectra suggest that propene adsorbs with its molecular plane tilted slightly with respect to the surface plane. Atomic oxygen, chemisorbed on the gold surfaces, was characterized using TPD and low energy electron diffraction (LEED), and its interaction with propene investigated. HREEL spectra of propene on the oxygen covered surfaces show shifts in the intensities and frequencies of the -CH@sub 2@ related vibrational features. Small amounts of product with masses 56 and 58 amu were observed for propene adsorbed onto a 0.4 ML oxygen-covered surface.