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Hybrid Technique Enables Single-Molecule Absorption Spectroscopy

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By combining rear-illumination, rapid excitation modulation and lock-in amplifier detection, investigators at the University of Illinois at Urbana-Champaign have used scanning tunneling microscopy to detect laser absorption by single molecules. The technique, which they reported in the online edition of Nano Letters, may have applications in analytical chemistry and in the study of the electrical properties of nanostructures and of energy transfer on surfaces where single-molecule fluorescence spectroscopy is unsuitable, they suggest. To demonstrate the approach, the researchers focused...Read full article

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    Published: January 2006
    As We Go To PressBasic ScienceBreaking Newslock-in amplifier detectionMicroscopyPresstime Bulletinrapid excitation modulationrear-illumination

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