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Articles
Photon Emission at Molecular Resolution Induced by a Scanning Tunneling Microscope
1 Institut de Physique Expérimentale, Université de Lausanne, CH-1015 Lausanne, Switzerland
The tip-surface region of a scanning tunneling microscope (STM) emits light when the energy of the tunneling electrons is sufficient to excite luminescent processes. These processes provide access to dynamic aspects of the local electronic structure that are not directly amenable to conventional STM experiments. From monolayer films of carbon-60 fullerenes on gold(110) surfaces, intense emission is observed when the STM tip is placed above an individual molecule. The diameter of this emission spot associated with carbon-60 is approximately 4 angstroms. These results demonstrate the highest spatial resolution of light emission to date with a scanning probe technique. Submitted on August 16, 1993Accepted on October 26, 1993
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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