| AVS 54th International Symposium | |
| Surface Science | Friday Sessions |
| Session SS1-FrM |
| Session: | Surface Dynamics |
| Presenter: | S.R. Bishop, University of California, San Diego |
| Authors: | S.R. Bishop, University of California, San Diego N.L. Tran, University of California, San Diego G.C. Poon, University of California, San Diego A.C. Kummel, University of California, San Diego |
| Correspondent: | Click to Email |
The investigation of the gas-surface reaction dynamics of NO with an iron phthalocyanine (FePc) monolayer utilizing King and Wells sticking measurements is reported. The initial sticking probability is determined to be a function of both incident molecular beam energy (0.09 - 0.4 eV) and surface temperature (100 - 300 K). NO adsorption onto FePc saturates at 3% of a monolayer (ML) at all incident beam energies and surface temperatures suggesting that the final chemisorption site is confined to the iron metal centers. At low surface temperature and low incident beam energy, the initial sticking probability is as great as 40% and decreases linearly with increasing beam energy and surface temperature. The results are consistent with the NO molecule sticking onto the monolayer FePc via physisorption to the aromatic periphery followed by diffusion to the Fe metal center. It is determined the NO molecule adsorbs to the FePc monolayer via a multiple pathway precursor-mediated chemisorption mechanism. The absorption mechanism of NO onto FePc was confirmed by control studies of NO sticking onto metal-free H2Pc, inert Au(111), and reactive Al(111).