An Introduction to Neutron Scattering - Spallation Neutron Source

The Study of Diffuse Scattering From Rough Surfaces Has
Not Made Much Headway Because Interpretation Is Difficult
The theory (Distorted Wave
2 2
from a rough surface, works in some cases but breaks down when ξ / k >> 1,
where ξ is the range of
In some
cases (e.g. faceted surfaces) one would also expect the approximation
using an " average
Born Approximation)
correlations
in thesurface
surface" wavefunction
used to describe scattering
for perturbation
theory
R
R
micro−rough
facet
=
R
k z
of
to break down.
=
R
smooth
smooth
e
−2
k
2
0
s
e
2
−2k
t
0k1
s
a
2