Accession Number : ADA180341

Title :   Research on Cryogenic Vacuum Tunneling.

Descriptive Note : Final rept. 1 Aug 84-31 Jan 87,

Corporate Author : STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS

Personal Author(s) : Quate,C F

PDF Url : ADA180341

Report Date : Apr 1987

Pagination or Media Count : 7

Abstract : 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.

Descriptors :   *CRYOGENICS, *TUNNELING, *VACUUM, *MICROSCOPES, ENERGY GAPS, GRAPHITE, LIQUID HELIUM, LOW TEMPERATURE, PHONONS, SCANNING, SPATIAL DISTRIBUTION, SPECTRA, SUBSTRATES, SUPERCONDUCTIVITY, SUPERCONDUCTORS, TOOLS, VARIATIONS, VIBRATIONAL SPECTRA

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE