# XCRYSTAL_BENT

## Function

Calculate the diffraction profiles of curved crystals. Several theoretical models are available in the xcrystal_bent program:

- Multilamelar model, useful for computing diffraction profiles of curved crystal in Bragg geometry

- Penning-Polder model, for crystals in Laue geometry.

- Takagi-Taupin. This model is in experimental status so results should be taken with extreme prudence. It is recommended not to use it if the user is not familiar with the theory

## Documentation

- application doc

- input parameters (main)

- input parameters (specific for Takagi-Taupin)

- See also: X-ray Optics

## Technical aspects

- Numerical calculations are done using the Fortran codes crystal_ml, crystal_za, crystal_pp and crystal_tt:

- The Zachariasen theory is for flat crystals. It is used here for comparison purposes.

- Specifoc parameters for the Takagi-Taupin theory are available at Set_Parameters>Takagi-Taupin specific parameters window.