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Science 24 January 2003:
Vol. 299. no. 5606, pp. 542 - 546
DOI: 10.1126/science.1078675

Reports

Vibrationally Resolved Fluorescence Excited with Submolecular Precision

X. H. Qiu,* G. V. Nazin,* W. Hodagger

Tunneling electrons from a scanning tunneling microscope (STM) were used to excite photon emission from individual porphyrin molecules adsorbed on an ultrathin alumina film grown on a NiAl(110) surface. Vibrational features were observed in the light-emission spectra that depended sensitively on the different molecular conformations and corresponding electronic states obtained by scanning tunneling spectroscopy. The high spatial resolution of the STM enabled the demonstration of variations in light-emission spectra from different parts of the molecule. These experiments realize the feasibility of fluorescence spectroscopy with the STM and enable the integration of optical spectroscopy with a nanoprobe for the investigation of single molecules.

Department of Physics and Astronomy and Department of Chemistry, University of California, Irvine, CA 92697-4575, USA.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: wilsonho{at}uci.edu


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