Reciprocal lattice

by Dr_Pill
Tags: lattice, reciprocal
 Mentor P: 27,565 It might help with the Forum formatting if you reduce the size of your image to no more than 800 pixels by 600 pixels. There's no reason for it to be THIS big. Zz.
P: 40
 Quote by ZapperZ It might help with the Forum formatting if you reduce the size of your image to no more than 800 pixels by 600 pixels. There's no reason for it to be THIS big. Zz.
Ok, like this? But now my picture is unsharp.

Mentor
P: 27,565

Reciprocal lattice

 Quote by Dr_Pill how can i resize it?
Remove the image, and upload a new, resized version.

Zz.
 P: 588 Dr. Pill, your images are in real space, not reciprocal space. It is perfectly possible to align a single crystal such that two or even three sets of lattice planes fulfull the Bragg condition simultaneously. For the two-beam case this can be done by aligning one Bragg peak (corresponding to the reciprocal space vector Q), and by then rotating the crystal about the vector Q until you excite a second reflection (=changing the azimuthal angle). To get 3 simultaneous reflections you also need to tune the photon energy just right. The effect is known by several names including "Umweganregung", "Renninger effect" and "Multiple beam diffracton". It was first described in 1935. The following links give a bit more informaiton: P. P. Ewald, Rev. Mod. Phys. v37, pp46 (1965) http://rmp.aps.org/abstract/RMP/v37/i1/p46_1 This is an excellent review article about the early theory of x-ray diffraction, written by one of the founding fathers. Highly recommended if you are interested in x-rays. Renninger, Z. Phys v. 106 pp 141 (1937) in German http://link.springer.com/article/10.1007%2FBF01340315 Description of a computer code for calculating Umwegs. http://www1.uni-hamburg.de/mpi/rossm...Z_Krist_85.pdf

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