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Fingerprinting Atoms
taksmaster
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4
3-2-2007 9:20 PM
640 views
tags:
science
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nanotechnology
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physics
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engineering
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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://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/723173a9-2b92-49da-bea0-ba6e523adf7e/BFDF95BC-015E-404E-9E00-B82DA35E0184/" 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://physicsweb.org/articles/news/11/2/25/1" href="http://physicsweb.org/articles/news/11/2/25/1" style="font-size: 11px;">physicsweb.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://physicsweb.org/articles/news/11/2/25/1">Physicists in Japan, Spain and the Czech Republic have developed a new type of atomic force microscope (AFM) that can "fingerprint" the chemical identity of individual atoms on a material's surface. </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://physicsweb.org/articles/news/11/2/25/1">The key challenge with this approach, however, is that the attractive chemical forces responsible for the topographic map are heavily dependent on the quality of the probe's tip – put simply, there is no way to give atomic species a "fingerprint" that remains consistent between measurements. Custance's team got over this hurdle by inventing a sensitive calibration method that begins by taking detailed readings of how the force on the tip varies with distance for different atoms, amassing numerous force-distance curves.</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://physicsweb.org/articles/news/11/2/25/1">although this technique is adept at distinguishing different atoms, until now it has been unable to divulge their actual chemical identity</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://physicsweb.org/articles/news/11/2/25/1">The AFM – invented some 20 years ago – is the best eye scientists have for examining atoms on the surfaces of both insulators and conductors</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/BFDF95BC-015E-404E-9E00-B82DA35E0184/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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