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IBM Scientists First to Image the 'Anatomy' of a Molecule
Date:8/27/2009

S=10&hits=10&RESULTFORMAT=&fulltext=ibm&searchid=1&FIRSTINDEX=0&sortspec=date&resourcetype=HWCIT" target="_new">Volume 324, Issue 5933, pp. 1428 - 1431) where IBM scientists measured the charge states of atoms using an AFM. These breakthroughs will open new possibilities for investigating how charge transmits through molecules or molecular networks. Understanding the charge distribution at the atomic scale is essential for building smaller, faster and more energy-efficient computing components than today's processors and memory devices. These components could one day contribute to IBM's vision of a smarter planet by helping instrument and interconnect the physical world.

As reported in the August 28 issue of Science magazine, IBM Research - Zurich scientists Leo Gross, Fabian Mohn, Nikolaj Moll and Gerhard Meyer, in collaboration with Peter Liljeroth of Utrecht University, used an AFM operated in an ultrahigh vacuum and at very low temperatures ( -268oC or - 451oF) to image the chemical structure of individual pentacene molecules. With their AFM, the IBM scientists, for the first time ever, were able to look through the electron cloud and see the atomic backbone of an individual molecule. While not a direct technological comparison, this is reminiscent of x-rays that pass through soft tissue to enable clear images of bones.

The tip that tipped the scale

The AFM uses a sharp metal tip to measure the tiny forces between the tip and the sample, such as a molecule, to create an image. In the present experiments, the molecule investigated was pentacene. Pentacene is an oblong organic molecule consisting of 22 carbon atoms and 14 hydrogen atoms measuring 1.4 nanometers in length. The spacing between neighboring carbon atoms is only 0.14 nanometers--roughly 1
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