Accession Number : AD0293497

Title :   STUDY OF SURFACE PROPERTIES OF ATOMICALLY-CLEAN METALS AND SEMICONDUCTORS

Corporate Author : BROWN UNIV PROVIDENCE RI BARUS RESEARCH LAB OF PHYSICS

Personal Author(s) : FARNSWORTH, H.E. ; MARSH, J. ; SHOOTER, D.

Report Date : OCT 1962

Pagination or Media Count : 44

Abstract : This report includes: A SEARCH FOR HYDROGEN - DEUTERIUM EXCHANGE ON CLEAN GERMANIUM SURFACES, by D. Shooter and H. E. Farnsworth. 9 June 61, 3p. (Reprint from Jnl. of Physical Chemistry 66:222-224, 1962) INVESTIGATIONS OF (100) AND (111) SURFACES OF SEMICONDUCTING DIAMOND BY LOW-ENERGY ELECTRON DIFFRACTION. 1962, 38p. incl. illus. tables. Previous experiments have shown that for germanium, silicon, and intermetallic compounds having a diamond type lattice, the positions of the atoms in the surface monolayer are displaced from their normal volume positions, so as to produce fractional order beams in certain azimuths. Low-energy (below 350 ev) electron diffraction patterns characteristic of the normal or x-ray surface lattice spacing of diamond have been obtained for both the (111) and (100) surfaces after only the usual bake-out of the tube at 300 C. Additional heating of the diamond produces an increase in pattern intensity to 100%, but heating above about 450 C in vacuum causes a decrease in diffracted intensity, due to a phase transformation in one or more surface monolayers. (Author)

Descriptors :   *DIAMONDS, *ELECTRON DIFFRACTION, *SURFACE PROPERTIES, ELECTRON GUNS, HIGH TEMPERATURE, LOW PRESSURE, MASS SPECTROSCOPY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE