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DMR-0079584

Speckle Pattern with Atomic and Molecular de Broglie Waves S.D. Kevan, University of Oregon Greg Elliott, University of Puget Sound. DMR-0079584.

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DMR-0079584

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  1. Speckle Pattern with Atomic and Molecular de Broglie Waves S.D. Kevan, University of Oregon Greg Elliott, University of Puget Sound DMR-0079584 One of the most compelling and useful features of laser light is that it is coherent. That is, light waves from a laser are orderly in time and in space. An important goal in several disciplines is to control and utilize the coherence of waves with short wave length: x-rays and matter waves, for example. Coherent waves with sub-nanometer wavelength will enable techniques that will allow us to probe the nanoscale world with very high fidelity. We have developed a source of spatially coherent molecular hydrogen and atomic helium matter waves. The upper figure shows an irregular set of apertures which, when illuminated by this coherent source, produces the speckle-diffraction pattern shown below. Future improvements in detectors will enable us to develop a microscope that forms images using helium atoms rather than light and which has a spatial resolution of a few nanometers. Physical Review Letters, 73, 013202 (2006).

  2. Speckle Pattern with Atomic and Molecular de Broglie Waves S.D. Kevan, University of Oregon Greg Elliott, University of Puget Sound DMR-0079584 Societal Impact: Aside from the pedagogically attractive goal of measuring atom interference patterns like the ones shown below, further development will lead to a new kind of ‘helium atom microscope’ that will have nanometer resolution and will be useful for studying many different kinds of hard and soft condensed matter systems. Education: Two graduate (Daniel Deponte and Forest Patton) and undergraduate students from the University of Oregon and (Kaz Usui and David Haskel) the University of Puget Sound (Eric Hoffman, Chris Bertrand, and Bethany Fisher) worked on this project. The lab web site http://physics.uoregon.edu/~kevancontains pictures and description of equipment and facilities, and recent research presentations. There are also links to web sites and notes for classes taught by Prof. Kevan.

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