Presentations

    Scientific elite or outcast?, at White House Forum "Making it happen: First in the World", Office of Science and Technology Policy, White House (Washington, DC), Wednesday, July 26, 1995
    Femtosecond surface photochemistry: what is the role of the substraste electrons?, at Femtochemistry: The Lausanne Conference (Lausanne, Switzerland), Thursday, September 7, 1995
    We studied the femtosecond laser-induced desorption of O2 and production of CO2 from a CO/O2/Pt(111) surface at 90K. The reaction pathway with 0.3-ps laser pulses is very different from that with nanosecond or continuous wave irradiation.[1,2] Our experiments address both the excitation excitation mechanism and the chemical pathway leading to O2 desorption and CO2 production using femtosecond laser pulses. When the fluence is below 10 µJ/mm2 the yields of O2 and CO2 vary linearly with laser fluence. Above 10 µJ/mm2 the yield is highly nonlinear in the fluence. The transition indicates a... Read more about Femtosecond surface photochemistry: what is the role of the substraste electrons?
    Scientific elite or outcast?, at Hearing on Disciplinary Perspectives of National Leaders in Undergraduate Education, National Science Foundation (Arlington, VA), Monday, October 23, 1995
    Understanding or Memorization: Are we Teaching the Right Thing?, at Faculty Forum Satellite Broadcast, National Technological University (Fort Collins, CO), Tuesday, November 12, 1996
    Signs that introductory physics course can lead to frustration (both for students and faculty) abound. A major problem is that traditional lectures in introductory science frequently fail to stimulate students to further study. Many (if not most) students concentrate on problem-solving without paying sufficient attention to the underlying concepts. Physics is then reduced to a set of recipes, or "problem solving strategies" are they are called in text books. The remaining, purely mechanical material is uninteresting and the apparent lack of any underlying consistency or logic leads to... Read more about Understanding or Memorization: Are we Teaching the Right Thing?
    Ultrafast laser-induced structural and electronic changes in solids, at PIERS 1997 (Hong Kong), Tuesday, January 7, 1997:
    For over two decades the subject of laser-induced phase transitions in semiconductors has generated considerable interest. This interest is due to the technological importancee of semiconductors and the research in this field was in part driven by the hope of developing better methods for the annealing of ion-implated semiconductors. More recently, femtosecond laser pulses have made it possible to study highly non-equilibrium electron and lattice dynamics in seminconductors. In this talk we first present an overview of work on laser-induced structural and electronic changes in solids, and... Read more about Ultrafast laser-induced structural and electronic changes in solids

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