File:U.S. Department of Energy - Science - 276 004 003 (16625683371).jpg

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Summary[edit]

Description

SCIENTIST STUDYING THE ATOMIC STRUCTURE AND CHEMISTRY OF HIGH-TEMPERATURE SUPERCONDUCTORS USING THE STEM.


THE SCANNING TRANSMISSION ELECTRON MICROSCOPE (STEM) DIFFERS FROM A CONVENTIONAL ELECTRON MICROSCOPE DUE TO ITS ABILITY TO MINIMIZE RADIATION DAMAGE. WITH A SCANNING TRANSMISSION ELECTRON MICROSCOPE, A SPECIMEN IS COOLED TO LIQUID NITROGEN TEMPERATURE AND SCANNED, RATHER THAN BEING IRRADIATED ALL AT ONCE. WHILE PASSING THROUGH THE SPECIMEN, SOME OF THE ELECTRONS INTERACT WITH IT, LOSING ENERGY TO WHATEVER THEY HIT OR CHANGING THEIR COURSE. DETECTORS COUNT EVERY TRANSMITTED ELECTRON, AND EACH ELECTRON CONTRIBUTES TO A FINAL PICTURE. AS A RESULT, FEWER ELECTRONS ARE NEEDED TO RECORD AN IMAGE THAN WITH OTHER ELECTRON MICROSCOPES, SO RADIATION DAMAGE TO THE SAMPLE IS MINIMIZED. THE PROCESS PERMITS SCIENTISTS TO SCRUTINIZE BIOLOGICAL SPECIMENS AT A RESOLUTION OF 2.5 ANGSTROMS. STEM CAN ALSO DETERMINE MOLECULAR WEIGHT AND MASS DISTRIBUTION WITHIN SINGLE MACROMOLECULES AND COMPLEXES.


For more information or additional images, please contact 202-586-5251.

Date
Source 276 004 003
Author U.S. Department of Energy from United States

Licensing[edit]

Public domain This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag.


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Checked copyright icon.svg This image was originally posted to Flickr by U.S. Department of Energy at https://flickr.com/photos/37916456@N02/16625683371. It was reviewed on by FlickreviewR 2 and was confirmed to be licensed under the terms of the United States Government Work.

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