Accession Number : AD0455713

Title :   PENETRATION OF HEAVY IONS OF KEV ENERGIES INTO MONOCRYSTALLINE TUNGSTEN,

Corporate Author : ATOMIC ENERGY OF CANADA LTD CHALK RIVER ONTARIO

Personal Author(s) : Kornelsen, E. V. ; Brown, F. ; Davies, J. A. ; Domeij, B. ; Piercy, G. R.

Report Date : 01 JUN 1964

Pagination or Media Count : 10

Abstract : The penetration of radioactive alkali metal (Na24) and inert gas ions into oriented monocrystals of tungsten was measured in the energy range 0.25 to 160 keV using an electrochemical stripping technique. For energies less than or equal to 20 keV, the ion bombardments were performed in ultrahigh vacuum with the crystal surfaces free of oxides and adsorbed gases. The resulting integral penetration distributions clearly confirm the theoretically predicted channeling of the incident ions along the more open directions in the crystal lattice. Maximum channel penetrations were observed to be about one order of magnitude larger than those measured for amorphous tungsten. Extremely penetrating tails on the penetration distributions were also observed, extending to greater than 5 mg/sq cm as compared to median penetrations of 0.01 to 0.2 mg/sq cm. It has been suggested to us that these are associated with excitation of the channeled atoms through multiple collisions. (Author)

Descriptors :   (*TUNGSTEN, ION BOMBARDMENT), (*ION BOMBARDMENT, TUNGSTEN), (*RADIOACTIVE ISOTOPES, ION BEAMS), CRYSTALS, CRYSTAL LATTICES, IONS, PENETRATION, XENON, SODIUM, ARGON, KRYPTON, TEMPERATURE, VACUUM, CANADA.

Distribution Statement : APPROVED FOR PUBLIC RELEASE