Research on Cryogenic Vacuum Tunneling.
Final rept. 1 Aug 84-31 Jan 87,
STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
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The Scanning Tunneling Microscope has been designed and constructed to operate at low temperature. In liquid helium at 4 K we have mapped the spatial variation of the superconducting energy gap. It, also, has been used for the first time to record the vibrational spectra of a molecule adsorbed on graphite and to image the molecule itself. The STM has also been used to record the phonon spectra of the graphite substrate. This is a new tool for low temperature studies which enables us to study the spatial variations in structure and spectra. Keywords Low temperature Superconductor Energy gap Spatial variations Vibrational spectra Tunneling.