Abstract
A study of the surface chemistry of coadsorbed NO and O2 on Pt(111) using electron energy loss spectroscopy (EELS), temperature programmed desorption (TPD), and photon induced desorption spectroscopy (PID) is presented. A 14N18O isotope exchange reaction product is detected in TPD of 14N16O/18O2/Pt(111) with the primary desorption peak occurring at 315 K. The wavelength dependence of photodesorption of 14N18O, 14N16O, and O2 from 14N16O/18O2/Pt(111) at 85 K with photons between 240 and 950 nm was measured, with that of 14N18O found to be very similar to O2 photodesorption. EELS features at 95 meV (δ(ONO)] and 155 meV (νs(ONO)] reveal the production of NO2 upon NO adsorption on O2Pt(111) at 90 K. A new adsorption state of NO, denoted γNO, formed upon coadsorption of NO with O2 on Pt(111) was characterized by a unique vibrational signature in EELS [νγ(N-O)=236 meV]. γNO was found to have a photodesorption cross section approximately 4000 times greater than that of NO adsorbed alone on clean Pt(111) due to photoyield enhancement by coadsorbed O2, while exhibiting a similar wavelength dependence to NOPt(111).
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