An Introduction to Neutron Scattering - Spallation Neutron Source
An Introduction to Neutron Scattering - Spallation Neutron Source
An Introduction to Neutron Scattering - Spallation Neutron Source
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What do the Amplitudes a R and a T Look Like?<br />
• For reflection from a flat substrate, both a R and a T are complex when k 0 < 4πρ<br />
I.e. below the critical edge. For a I = 1, we find:<br />
1<br />
0.5<br />
-0.5<br />
-1<br />
0.005 0.01 0.015 0.02 0.025<br />
Real (red) & imaginary (green) parts of a R<br />
plotted against k 0 . The modulus of a R is<br />
plotted in blue. The critical edge is at<br />
k 0 ~ 0.009 A -1 . Note that the reflected wave is<br />
completely out of phase with the incident wave<br />
at k 0 = 0<br />
2<br />
1.5<br />
1<br />
0.5<br />
-0.5<br />
-1<br />
0.005 0.01 0.015 0.02 0.025<br />
Real (red) and imaginary (green) parts<br />
of a T . The modulus of a T is plotted in<br />
blue. Note that a T tends <strong>to</strong> unity at<br />
large values of k 0 as one would expect
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