Thought for the month

“You cannot have freedom without a rule of law ... and if you don't have it, what you tend to get is corruption and that is death to freedom, it's death to truth, it's death to honour, it's death to democracy.”

Margaret Thatcher, 1 October 1996.

Monday, 19 April 2010

Z contrast sees small

Using Z -contrast (atomic number) scanning transmission electron microscopy (www.ornl.gov/info/press_releases/get_press_release.cfm?ReleaseNumber=mr20100325-00) researchers at the Oak Ridge National Laboratory have obtained the first images that distinguish individual light atoms such as boron, carbon, nitrogen and oxygen. An international team analysed boron nitride samples prepared by Oxford University researchers, using STEM energies (60KeV) low enough to avoid displacement damage in low atomic number elements. The microscope manufacturer (Nion Company, www.nion.com) has clearly picked up with cold field emission STEM where the former VG Microscopes left off.

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