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Researchers from University of Melbourne Describe Findings in Microscopy (High-Coherence Electron and Ion Bunches From Laser-Cooled Atoms)

September 12, 2014

By a News Reporter-Staff News Editor at Science Letter -- Fresh data on Microscopy are presented in a new report. According to news reporting from Parkville, Australia, by NewsRx journalists, research stated, "Cold atom electron and ion sources produce electron bunches and ion beams by photoionization of laser-cooled atoms. They offer high coherence and the potential for high brightness, with applications including ultra-fast electron-diffractive imaging of dynamic processes at the nanoscale."

The news correspondents obtained a quote from the research from the University of Melbourne, "The effective brightness of electron sources has been limited by nonlinear divergence caused by repulsive interactions between the electrons, known as the Coulomb explosion. It has been shown that electron bunches with ellipsoidal shape and uniform density distribution have linear internal Coulomb fields, such that the Coulomb explosion can be reversed using conventional optics. Our source can create bunches shaped in three dimensions and hence in principle achieve the transverse spatial coherence and brightness needed for picosecond-diffractive imaging with nanometer resolution. Here we present results showing how the shaping capability can be used to measure the spatial coherence properties of the cold electron source. We also investigate space-charge effects with ions and generate electron bunches with durations of a few hundred picoseconds."

According to the news reporters, the research concluded: "Future development of the cold atom electron and ion source will increase the bunch charge and charge density, demonstrate reversal of Coulomb explosion, and ultimately, ultra-fast coherent electron-diffractive imaging."

For more information on this research see: High-Coherence Electron and Ion Bunches From Laser-Cooled Atoms. Microscopy and Microanalysis, 2014;20(4):1008-1014. Microscopy and Microanalysis can be contacted at: Cambridge Univ Press, 32 Avenue Of The Americas, New York, NY 10013-2473, USA. (Cambridge University Press -; Microscopy and Microanalysis -

Our news journalists report that additional information may be obtained by contacting B.M. Sparkes, University of Melbourne, Sch Phys, ARC Center Excellence Coherent Xray Sci, Parkville, Vic 3010, Australia. Additional authors for this research include D.J. Thompson, A.J. McCulloch, D. Murphy, R.W. Speirs, J.S.J. Torrance and R.E. Scholten (see also Microscopy).

Keywords for this news article include: Parkville, Australia, Australia and New Zealand, Microscopy

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Source: Science Letter

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