Coherent Backscattering from Multiple Scattering Systems - KOPS ...

5 Experiments
1
0.8
α c
(A)
α c
(A) + αc
(B+C)
R700 with ℵ=1
R700 with ℵ=0.92
cooperon
0.6
0.4
0.2
0
0 10 20 30 40 50 60 70 80 90
scattering angle [deg]
1
0.8
α c
(A)
α c
(A) + αc
(B+C)
NIX−2 with ℵ=1
NIX−2 with ℵ=0.93
cooperon
0.6
0.4
0.2
0
0 10 20 30 40 50 60 70 80 90
scattering angle [deg]
Figure 5.7: Example wide angle backscattering data. Top: R700, bottom: NIX-2. If the
different albedos of sample and reference are neglected (red), the data clearly violate
conservation of energy and do not fit with any theory. The correctly evaluated data
(orange) deviate significantly from α (A)
c , but fit very well with α c = α (A)
c + α (B+C)
c within
the region of confidence (which is only marginally larger than the data points and is
therefore not drawn explicitly). For R700 one obtains kl ∗ = 2.7(3) and l ∗ = 250(30) nm,
and kl ∗ = 6.4(3) and l ∗ = 600(30) nm for NIX-2. The integration over the cooperon
yields E = −0.024(5) sterad for R700 and E = −0.013(7) sterad for NIX-2 if the error of
the albedo is set to zero. E is zero within the margins of error if the error of the albedo
is 1%.
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