Accession Number:

ADA089959

Title:

Interactions of Molecular Ion Beams with Surfaces.

Descriptive Note:

Rept. no. 1 (Final) 1 Jul 79-30 Jun 80,

Corporate Author:

HOUSTON UNIV TX DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1980-09-08

Pagination or Media Count:

10.0

Abstract:

Reactions of positive N2 ion beams with the surface of polycrystalline rhenium foil over the range 150-3000 eV have been studied by the techniques of X-ray photoelectron spectroscopy XPS and thermal desorption spectrometry TDS. The reactions produce a nitride layer of the type ReNx, 0.21 less than or equal to X less than or equal to 0.40, with x varying as a function of ion kinetic energy and depth into the surface. The nitride layer extends from the surface down to the penetration depth of the atoms, which varies from approx. 15 angstroms at 0.3 keV to approx. 76 angstoms at 2.5 keV ion energy. The product nitride and chemisorbed nitrogen on Re are distinctly different, exhibiting N1s binding energies of 397.9 and 396.8 eV, respectively, and TDS maxima near 425 and 600 C, respectively.

Subject Categories:

  • Particle Accelerators

Distribution Statement:

APPROVED FOR PUBLIC RELEASE