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Science Highlights


Science highlights feature research conducted by staff and users at the ALS.

If a Power Point summary slide or a PDF handout of the highlight is available, you will find it linked beneath the highlight listing and on the highlight's page. You may also print a version of a highlight by clicking the print icon associated with each highlight.



Time-Resolved Study of Bonding in Liquid Carbon Print
Wednesday, 28 September 2005 00:00

We are accustomed to observing carbon in its elemental form as a solid, ranging from the soft "lead" in pencils to the precious gemstone in diamond rings. While considerable attention has been focused on solid forms of carbon, the properties of liquid carbon are much more difficult to measure accurately.

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Direct Imaging of Asymmetric Magnetization Reversal Print
Wednesday, 28 September 2005 00:00

By using x-ray photoemission electron microscopy at the ALS to directly image the magnetic structure of an exchange-biased film, a team from the University of Washington and the Stanford Synchrotron Radiation Laboratory has identified separate magnetic-reversal mechanisms in the two branches of a hysteresis loop.

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New Zone Plate for Soft X-Ray Microscopy at 15-nm Spatial Resolution Print
Wednesday, 31 August 2005 00:00

The XM-1 soft x-ray microscope at the ALS produces images that not only reveal structures but can identify their chemical elements and measure magnetic and other properties as well.

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Photoexcitation of a Volume Plasmon in Buckyballs Print
Wednesday, 31 August 2005 00:00

The latest results from a U.S.–German collaboration on the electronic structure of photoexcited buckyball ions show an additional resonance near 40 eV, characterized as a volume plasmon made possible by the special fullerene geometry.

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Enol Intermediates Unexpectedly Found in Flames Print
Wednesday, 27 July 2005 00:00

An international team of researchers has identified chemical compounds known as enols as apparently ubiquitous intermediates in flames burning a variety of fuels. This surprising observation will require combustion modelers to revise their models to account for the presence of these compounds.

Handout

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A Hollow-Ion Resonance of Unprecedented Strength Print
Wednesday, 29 June 2005 00:00

At the Ion-Photon Beamline at the ALS, researchers have detected in negative helium ions a resonant simultaneous double-Auger decay of unprecedented strength, evidence of a triply excited hollow-ion state that has eluded observation for 25 years.

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Composition and Reactions of Atmospheric Aerosol Particles Print
Wednesday, 29 June 2005 00:00

Microscopic aerosol particles in the atmosphere contain carbonaceous components from mineral dust and combustion emissions released from around the world. How long these tiny particles remain in the atmosphere can have a huge impact on the global climate.

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Energetics of Hydrogen Bond Network Rearrangements in Liquid Water Print
Wednesday, 25 May 2005 00:00

The unique chemical and physical properties of liquid water are thought to result from the highly directional hydrogen bonding (H-bonding) network structure and its associated dynamics. With the help of a novel liquid microjet apparatus, researchers derived a new energy criterion for H-bonds based on experimental data.

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Substrate Recognition Strategy for Botulinum Neurotoxin Print
Wednesday, 25 May 2005 00:00

Clostridal neurotoxins (CNTs) are the causative agents of the neuroparalytic diseases botulism and tetanus. Researchers from Stanford University have now determined the first structure of a CNT in complex with its target.

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How the Membrane Protein AmtB Transports Ammonia Print
Wednesday, 25 May 2005 00:00

While life scientists have solved the structures of protein channels for ions, uncharged solutes, and even water, up to now they have only been able to guess at the precise mechanisms by which gases cross biological membranes.

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Influence of Topological Spin Fluctuations on Charge Transport Print
Wednesday, 27 April 2005 00:00

Layered transition metal oxides are the focus of intense research efforts because they might clarify the superconducting mechanism of cuprate high-temperature superconductors (HTSCs).

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Electron Trapping by Molecular Vibration Print
Wednesday, 27 April 2005 00:00

In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations.

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ARPES Provides Direct Evidence of Spin-Wave Coupling Print
Wednesday, 30 March 2005 00:00

The electronic properties of a metal are determined by the dynamical behavior of its conduction electrons. Conventional band theory accounts for the interaction of the electrons with the static ion lattice.

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A New Gap-Opening Mechanism in a Triple-Band Metal Print
Wednesday, 23 February 2005 00:00

A collaboration between researchers have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band.

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Extracting the Eliashberg Function Print
Wednesday, 23 February 2005 00:00

Recent advances in experimental techniques combined with ever-growing theoretical capabilities now hold the promise of presenting an unprecedented picture of violations of the Born-Oppenheimer approximation (BOA), which decouples electronic from nuclear motion in quantum calculations of solids.

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