Hi everyone,
Could anyone help me with this.
Why is that the Darwin reflectitivity curve plotted versus rotation
angle (in text books for example) and rocking curve plotted against
rotation angle (observed in the oscilloscope at XAS beamlines for
example) look different?
I understand that the
Just to follow up a little on Matthew's answer:
The Darwin width is the angular width over which a particular
reflection will diffract. A rocking curve measurement usually leaves
one crystal at a fixed angle and rotates the second crystal. For a
perfectly collimated beam, the resulting
Following up on Matt's following up on my answer:
Let's pretend that the Darwin curve is a simple rectangle, reflectivity=1 within the Darwin band and 0 outside. Now consider a
given energy, with the source having a wide angular
distribution. The first crystal will select a range of angles to
