MEASUREMENTS OF PHOTON INTENSITY MAP FOR METAL PARTICLES BY SCANNING-TUNNELING-MICROSCOPY

We have measured maps of the photon intensity emitted from gold metal particles in scanning tunneling microscopy (STM) of metal films in ult ra high vacuum. The photon images are obtained with a spatial resoluti on in a nanometer scale. The photon intensity is recorded simultaneous ly with the measurements of a topography image of the film by STM. We have measured photon images for various morphologies of the film. The observed photon maps are well correlated with the morphology. The phot on maps for the dense aggregation of small particles show similar cont rasting particles to those on the corresponding morphology. The photon intensity for the rough surface is influenced by the surface geometry of the tip and the particles. and the contrast of the photon map is m odified from the morphology. We have observed that the photon intensit y is dependent on the material and the grain of the material. The effe ct of the asymmetry of the rip shape on the photon map is found.