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  • THE ELECTRONIC ALADDIN NEWSLETTER NO. 31

    November 2002


    1. Science Directorate Appointed


    A three-person interim Scientific Directorate has been appointed to replace former Research Director Franz Himpsel. These interim directors have been given the task of providing leadership in the research and education areas at SRC.


    Professor Juan Carlos Campuzano (University of Illinois-Chicago) is a leading researcher in high-temperature superconductors using synchrotron radiation techniques. As interim Scientific Director for Condensed Matter, he will oversee the SRC core programs in highly correlated systems, superconductors, magnetism, and atoms/ions/molecules.


    Professor Gelsomina "pupa" De Stasio (UW-Madison) is a leader in spectromicroscopic analysis, which she has pioneered and applied to investigations of a new brain cancer therapy. She has also collaborated on projects in many other fields, including a study of mineral-metabolizing bacteria and a geological project investigating 4.4 billion year old zircons that provide information about the early earth. Her varied interests and experience make her well-suited for interim Scientific Director for Multidisciplinary Science. In this position she will focus on fostering crosscutting applications of synchrotron light.


    Professor James Taylor (UW-Madison) is the former SRC Executive Director and is currently Associate Director for the Center for NanoTechnology, where his research centers on developing and characterizing resists for nanocircuits. An essential aspect of his role as interim Scientific Director for Educational Programs will be to develop educational material on beamlines and research instrumentation of general interest to the synchrotron radiation community.


    2. New Hires


    Assistant Scientist: Dr. Lisa Wiese was hired in July to provide experimental support for spectromicroscopy users. She will be working with Gelsomina "pupa" De Stasio to assist users both in operating the instrumentation and analyzing the data. Dr. Wiese obtained her PhD. in Atomic Molecular Optical Physics from the University of Nebraska-Lincoln in 1998 and has spent the last three years at SRC as a postdoc with Jim Lawler working on laboratory astrophysics.


    Technical Writer: Rebecca Kinraide was hired in October to provide technical and science writing, web development and outreach support for the SRC Shared Administration and the SRC Outreach Coordinator. Ms. Kinraide is a graduate student in History of Science at UW-Madison and has previously worked as a technical writer for the Physical Sciences Laboratory and the Center for NanoTechnology.

     


    3. The 35th SRC Users' Meeting


    This year's Users' Meeting provided a positive atmosphere for the discussion of research and new opportunities at the SRC. Thanks to the efforts of Dave Lynch, the program chair, the meeting was interesting and meaningful. The talks described recent work at SRC which is at the leading edge of many scientific fields. The poster session, with nearly 40 posters, provided an opportunity for researchers to showcase their work and foment discussion. The banquet, held at the Dry Bean, provided good food and an informal atmosphere. Approximately 75 participants attended the meeting.


    Among the most exciting talks were those given by this year's winners of the Aladdin Lamp Award for the most impressive thesis work performed at the SRC, Jason Crain and Adam Kaminski. Jason Crain is a member of the Department of Physics, University of Wisconsin-Madison, under the advisorship of Franz Himpsel. Jason described the construction of metal wires consisting of single atoms lined up one after the other. These wires, which cannot exist by themselves, are made by having the atoms line up on a specially prepared surface of Silicon. Unlike normal metal wire, in which electrons hop from atom to atom, with more electrons hopping in the direction of the electric field, carrying the current, in these artificial one-dimensional wires electrons appear to break up into two waves, one carrying the charge in one direction, and the other carrying the spin of the electron in the other direction.


    Adam Kaminski is a member of the Department of Physics, University of Illinois at Chicago, under the advisorship of Juan Carlos Campuzano. Adam described experiments on time reversal symmetry breaking. Adam and his collaborators find that high-temperature superconductors not only exhibit the strange pseudogap phenomena, but that in this state the motion of an electron forward is not the same as the motion backwards. This is unlike most motion in nature, where if an event is played backward the moving object would return to its original position.


    Other talks of note were ones given by Ben Gilbert and Brandon Sonderegger. Ben showed that the world of nanoparticles is much more complicated than previously thought. He finds that in small particles, the atoms do not keep the arrangements that they have in large crystals, but become rather disordered. But more interestingly, adsorption of some molecules on the surface of the nanoparticles restores the order of the atoms inside it. Brandon spoke about the new possibility of killing deadly brain cancer tumors called glioblastomas by using neutrons in a way that does not destroy the surrounding healthy tissue. Brandon and collaborators are using a novel microscope developed at SRC that can tell researchers when the neutron-absorbing molecules have been localized in the cancerous cells, but not in the healthy ones. Once this is accomplished it may lead to a very effective therapy.


    Mark Bissen chaired a discussion about the next high impact beamline to be built at SRC. Mark is currently continuing that discussion by e-mail, and the beamline characteristics (energy range, resolution, flux, spot size) will be determined by the end of November.


    The winner of the Best Poster competition was Jens Paggel (Freie Universitat Berlin, Institute fur Experimentalphysik) for his poster entitled "Quantum Oscillations in the Work Function of Atomically-Uniform Films: Theory and Experiment for Ag/Fe(100)."

     


    4. SRC Workshop on Phonon-Electron Interaction


    The workshop the day after the Users' Meeting was on the subject of the electron-phonon interaction, which now can be studied by photoelectron spectroscopy at synchrotron radiation sources. It was a tribute to the late Eric Jensen, an early user of Tantalus at SRC who was the first to find the effect of the electron-phonon interaction in photemission. Ward Plummer began the workshop with a moving description of Eric and his work. There was lively discussion regarding whether experiments on high-temperature superconductors are influenced by phonons, but perhaps the most intriguing talk was given by a student, Luca Perfetti, who showed how photoemission can directly show the fluctuations occurring just before a phase transition occurs. In this case, he described the large density wave transition, which has also been studied for some time, but never with such amazing detail. Luca also showed the tell-tale signs of an unusual metal-insulator transition called the Mott transition. This elusive transition, believed to be operational in the high temperature superconductors, is observed by Luca to occur unexpectedly in a Fermi liquid material at the surface, where the changed potential sets up just the right conditions. Forty people attended the workshop.


    More information on the meeting and workshop can be found at the SRC website at
    http://www.src.wisc.edu/meetings/SRC_UM2002/

     


    5. New NSF Program Director Visits SRC


    Dr. Hugh Van Horn, our new NSF Program Director (National Facilities, Division of Materials Research) made his first visit to the Synchrotron Radiation Center on October 18th. Joe Bisognano gave him an overview of the facility and its operations and discussed the developing long range plan based on the spring meeting of the Dean's Outside Review Committee. Juan Carlos Campuzano described the core programs in high temperature superconductors and low dimensional systems and the need for a next generation, high performance beamline. Gelsomina "pupa" De Stasio presented the broad range of present and future research with new Users enabled by photoemission electron microscopy (PEEM) techniques, including brain cancer therapy, geology, microbiology, and environmental science.


    During a two-hour tour of Aladdin and the beamlines, Dr. Van Horn engaged in animated conversations with users, staff, and students on a variety of research topics including the nanolithography program of CNTech, infrared experiments, the Scienta 2002 analyzer, the new Wadsworth beamline, and fluorescence.


    Over lunch Jim Taylor presented SRC's plans for education development including the development of tools for training in beamline techniques. Associate Dean Terry Millar of the UW Graduate School also participated in the discussion and commented on coordination with the newly funded Wisconsin Center for Education Research. After lunch, Dr. Van Horn met with Graduate School Dean Martin Cadwallader, who is principal investigator for the SRC-NSF Cooperative Agreement. The discussions included planning for the spring 2004 interim review. SRC was encouraged to look confidently toward its long range future and to develop initiatives to advance its scientific impact. This encouragement was shared with the Users' Advisory Committee prior to the Users' Meeting of October 25th and with the users attending the annual meeting.

     


    6. Congratulations to:


    Max G. Lagally, E.W. Mueller Professor in the Department of Materials Science and Engineering at the University of Wisconsin-Madison, was awarded a 2002 Tibbetts Award for his company Piezomax Technologies, Inc. (now nPoint Inc.) and for leading this Madison company to successful development of nanomotion products. The Tibbitts Award honors individuals, small firms, projects, and organizations that have used the stimulus of Small Business Innovation Research funding to make a clear and definable difference.

     


    7. Notes


    The new beamline schedule for the next 6 months has been posted on the website at
    http://www.src.wisc.edu/facilities/beamlines/schedule/


    There will be an infrared workshop in January at SRC. The link is:
    http://www.src.wisc.edu/irworkshop/


    The SRC annual report was sent to the NSF in October