Accession Number:

AD0628016

Title:

ATOMIC DISPLACEMENTS IN ONE- AND TWODIMENSIONAL DIFFUSION,

Descriptive Note:

Corporate Author:

GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER

Personal Author(s):

Report Date:

1965-10-01

Pagination or Media Count:

15.0

Abstract:

The statistics of surface diffusion phenomena are developed for the conditions appropriate to measurements in the ion microscope. Examined in detail are 1 the effect of boundaries lattice steps on the mean square displacement in a random walk 2 the probability density for distances traversed in a two-dimensional walk along nonorthogonal surface channels and 3 the distribution of distances for random walks in which the number of jumps is subject to fluctuation, as it is in real systems. Both reflecting and adsorbing boundaries are found to diminish the mean square displacement in the same fashion. The effect of nonorthogonality, and even more so of fluctuations, is to enhance the frequency of small displacements when compared with a Rayleigh distribution. Author

Subject Categories:

  • Physical Chemistry
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE