X-ray optical element and diffractometer with a soller slit
An X-ray optical element ( 1, 1′, 1″ ) with a Soller slit comprising several lamellas for collimating an X-ray beam with respect to the direction of the axis ( 5, 15 ) of the Soller slit, and a further collimator for delimiting an X-ray ( 10 ), wherein the further collimator is rigidly connected to the Soller slit ( 2, 14 ) during operation, is characterized in that the X-ray beam ( 10 ) delimited by the further collimator intersects the axis ( 5, 15 ) of the Soller slit within the Soller slit, and the direction of the X-ray beam ( 10 ) subtends an angle α≧10° with respect to the axis ( 5, 15 ) of the Soller slit. An X-ray optical element ( 1, 1′, 1″ ) with a Soller slit ( 2, 14 ) and a further collimator is thereby realized, which permits automatic change between the Soller slit ( 2, 14 ) and the further collimator.
1. An X-ray optical element for collimating an X-ray beam, the element comprising:
a Soller slit having an axis defined by a plurality of lamellas, said lamellas collimating the X-ray beam with respect to a direction of said axis; and
a collimator for delimiting the X-ray beam, said collimator being rigidly connected to said Soller slit during operation of the optical element, wherein the X-ray beam delimited by said collimator intersects said axis of said Soller slit within said Soller slit, a direction of the X-ray beam thereby subtending an angle α≧10° with respect to said axis of said Soller slit.
2. The X-ray optical element of claim 1 , wherein said Soller slit is a linear Soller slit.
3. The X-ray optical element of claim 1 , wherein said Soller slit is a radial Soller slit.
4. The X-ray optical element of claim 2 , wherein said lamellas of said linear Soller slit are disposed parallel to a direction of the X-ray beam delimited by said collimator.
5. The X-ray optical element of claim 1 , wherein said Soller slit has a recess perpendicular to said Soller slit axis.
6. The X-ray optical element of claim 1 , wherein said Soller slit comprises two partial slits, wherein said collimator is at least partially disposed between said two partial slits.
7. The X-ray optical element of claim 1 , wherein said collimator has at least two collimator jaws, said collimator jaws being disposed on different sides of said Soller slit.
8. The X-ray optical element of claim 7 , wherein said collimator jaws subtend an angle with respect to said axis of said Soller slit which differs from 90° or an angle of 45°.
9. The X-ray optical element of claim 1 , wherein said collimator is disposed on one side of said Soller slit.
10. The X-ray optical element of claim 9 , wherein said collimator is made in one piece.
11. The X-ray optical element of claim 1 , wherein said collimator is made from tantalum.
12. The X-ray optical element of claim 1 , wherein a geometry of said collimator or of a collimator opening in said collimator can be adjusted in a non-operating state.
13. The X-ray optical element of claim 1 , wherein said collimator is a further linear Soller slit.
14. The X-ray optical element of claim 13 , wherein said Soller slit is a linear Soller slit, said linear Soller slit and said further linear Soller slid having different divergence angles.
15. The X-ray optical element of claim 1 , wherein said collimator is a further radial Soller slit.
16. The X-ray optical element of claim 15 , wherein said Soller slit is a radial Soller slit, said radial Soller slit and said further radial Soller slit having different opening angles and/or different divergence angles.
17. A diffractometer having a source for generating a primary beam, a sample holder for arranging a sample, a detector for detecting a secondary beam emitted by the sample, and the X-ray optical element of claim 1 .
18. The diffractometer of claim 17 , wherein the X-ray optical element is installed in the diffractometer in such a fashion that it can be rotated about an axis of rotation which is perpendicular to said axis of said Soller slit.
19. The diffractometer of claim 18 , further comprising a motor for rotating the X-ray optical element.
20. The diffractometer of claim 18 , further comprising automatic control or computer control of rotation of the X-ray optical element.
21. The diffractometer of claim 17 , wherein the X-ray optical element is disposed on a side of the primary beam.
22. The diffractometer of claim 17 , wherein the X-ray optical element is disposed on a side of the secondary beam.
23. The diffractometer of claim 22 , wherein said detector is disposed in a point of intersection of the lamella directions of at least one radial Soller slit.
24. The diffractometer of claim 21 , wherein said sample holder is disposed in a point of intersection of lamella directions of at least one radial Soller slit.
25. The diffractometer of claim 21 , wherein said source is disposed in a center of at least one radial Soller slit.