lorentzian_precession#
- diffsims.utils.shape_factor_models.lorentzian_precession(excitation_error, max_excitation_error, r_spot, precession_angle)[source]#
Intensity profile factor for a precessed beam assuming a Lorentzian intensity profile for the un-precessed beam. This is equation (10) in reference [1].
- Parameters:
- excitation_errorarray_like or
float The distance (reciprocal) from a reflection to the Ewald sphere
- max_excitation_error
float The distance at which a reflection becomes extinct
- r_spotarray_like or
float The distance (reciprocal) from each reflection to the origin
- precession_angle
float The beam precession angle in radians; the angle the beam makes with the optical axis.
- excitation_errorarray_like or
- Returns:
- intensity_factorarray_like or
float Vector representing the rel-rod factor for each reflection
- intensity_factorarray_like or
References
[1] L. Palatinus, P. Brázda, M. Jelínek, J. Hrdá, G. Steciuk, M. Klementová, Specifics of the data processing of precession electron diffraction tomography data and their implementation in the program PETS2.0, Acta Crystallogr. Sect. B Struct. Sci. Cryst. Eng. Mater. 75 (2019) 512–522. doi:10.1107/S2052520619007534.