Electron microscope sees single hydrogen atoms


	Electron microscope sees single hydrogen atoms

dewitte

7-20-2008 11:03 AM

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tags:

microscope, hydrogen, atom, tem

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/7c51ec57-286f-4f2c-a935-e2f2f788d069/D6D887F7-57DD-4CEF-8839-C05ACFEFD0EF/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://physicsworld.com/cws/article/news/35034" href="http://physicsworld.com/cws/article/news/35034" style="font-size: 11px;">physicsworld.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://physicsworld.com/cws/article/news/35034"><P>Physicists in the US claim to have used a transmission electron microscope (TEM) to see a single hydrogen atom – the first time that a TEM has been used to image such a light atom. The breakthrough was made by supporting the atom on graphene — a sheet of carbon just one atom thick. The team has also been able to watch hydrocarbon chains move across the graphene surface, suggesting that the technique could be used to study the dynamics of biological molecules. 
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://physicsworld.com/cws/article/news/35034"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/physicsworld.com/img/C9800FBE-A3C4-4A06-971C-D0AD76027FC4" alt="Hydrogen and carbon atoms on graphene" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://physicsworld.com/cws/article/news/35034"><P>
There is nothing new in using TEMs to see individual atoms, but until now such instruments could only be used to image heavy atoms. One reason is that a TEM creates an image by shining an electron beam on a sample and measuring how much it is deflected by atoms of interest. Lighter atoms deflect electrons less than heavier atoms, which means that only the latter show up on an image.
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