STMimage_08

STMimage_08 - Special Topic Creating and Imaging Molecular...

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Special Topic Creating and Imaging Molecular Bonds with a Scanning Tunneling Microscope (STM) at USC: Mark Thompson, Chemistry Ari Requicha, Comp. Sci. Chongwu Zhao, EE Steve Cronin, EE Wilson Ho: UC Irvine By Bill Steele http://www.physics.uci.edu/~wilsonho/news.htm
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At the USC Molecular Robotics Laboratory: Prof. Ari Requicha Moving Gold clusters around
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At the USC Molecular Robotics Laboratory: Prof. Ari Requicha Moving Gold clusters around
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Observing Single Molecules in Action by Scanning Tunneling Microscopy Scanning tunneling microscope (STM) A sharp tip of molecular dimensions is lowered close to the sample and a voltage and current is applied to the tip. At short distances a tunneling current is transferred to the surface atom and measured: electrons are transferred to empty orbitals of the molecule. current vs distance Temperature is ~10 K to freeze motion and reduce vibrations and rotations.
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Red circles show delocalized π orbitals on 5-membered rings Bare molecules and molecules covered with Xe atoms
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By reversing the voltage, the Xe atom can be dropped at the right position
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STMimage_08 - Special Topic Creating and Imaging Molecular...

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