Interpreting LEED images

From: Andrew Stallard (astallard_at_regalmann.com)
Date: 03/08/05 

Date: 7 Mar 2005 19:16:11 -0800

have a set of two dimensional LEED images* of GaN(0001). The electron
energies are known. I can make out the fringe patterns and the spots.
However, I do not know the height of the electron gun so I can
calculate the scattering angle.
The equation is:

n(wavelength)=d Sin(Angle)

n(wavelength)=d h/Squre Root(h^2 + r^2)

Where n is the diffraction order, d is the distance between the atoms,
r is the distance from one atom to the center of the beam, and h is
height of the elctron gun relative to the surface. I also know the
initial beam diameter is 1 micrometer. I need to figure out the distace
and the angle. Does anybody know how to interpret these diagrams?

* Unfortunately, I do not have a scanner so I can not upload a
photograph.

Thank You for Responding:

Andrew Stallard

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