Monday, April 3, at 12:10 p.m. in CUE 419
The Gene and Linda Voiland School of Chemical Engineering and Bioengineering are hosting a seminar presented by Dr. David Lee, Department of Chemistry, WSU
Dr. Lee earned his B.S. in Chemistry and M.S. in Synthetic Organic Chemistry from Rochester Institute of Technology before completing his Ph.D. degree at Cornell University under the direction Prof. Paul L. Houston in Physical Chemistry. At Cornell, he investigated the product states of hydrocarbon radical dissociations in gas phase, both experimentally and theoretically, using ion-imaging and semi-classical simulations. After graduate school, he joined Prof. S. Alex Kandel’s Scanning Tunneling Microscopy (STM) group at University of Notre Dame as a post-doctoral fellow. At Notre Dame, he applied his graduate knowledge of gas-phase reactions onto the investigation of reactions taking place on organic surface monolayers upon the bombardment of gas-phase atoms. Dr. Lee’s research program at WSU centers around in-situ microscopy in the investigation of chemical changes that occur when material surfaces interact with photons and with gas-phase reactants. Multiple techniques, including molecular beams, laser stimulation/photolysis and X-ray photoelectron spectroscopy, are employed associatively with STM to study these topics from the perspective of fundamental experimental physical chemistry.
“Radical Induced Materials Modifications: STM, STS and Atomic Oxygen.”
Materials surface structure and energy level modifications by direct exposure to gas-phase atomic oxygen was examined with sub-nanometer resolution using scanning tunneling microscopy and spectroscopy (STM and STS). By direct comparison of surface structures and energy levels before and after the reaction, the gas-surface interaction has modified the surface topography and altered the electronic structures of the materials. Detailed instrumental design, as well as atomic-scale measurements on two distinct surfaces of monolayer graphene and of organometallic porphyrins, will be presented and discussed.
