Calculation of x-ray scattering patterns from nanocrystals at high x-ray intensity
Abstract
We present a generalized method to describe the x-ray scattering intensity of the Bragg spots in a diffraction pattern from nanocrystals exposed to intense x-ray pulses. Our method involves the subdivision of a crystal into smaller units. In order to calculate the dynamics within every unit we employ a Monte-Carlo (MC)-molecular dynamics (MD)-ab-initio hybrid framework using real space periodic boundary conditions. By combining all the units we simulate the diffraction pattern of a crystal larger than the transverse x-ray beam profile, a situation commonly encountered in femtosecond nanocrystallography experiments with focused x-ray free-electron laser radiation. Radiation damage is not spatially uniform and depends on the fluence associated with each specific region inside the crystal. To investigate the effects of uniform and non-uniform fluence distribution we have used two different spatial beam profiles, gaussian and flattop.
Keywords
Cite
@article{arxiv.1607.01938,
title = {Calculation of x-ray scattering patterns from nanocrystals at high x-ray intensity},
author = {Malik Muhammad Abdullah and Zoltan Jurek and Sang-Kil Son and Robin Santra},
journal= {arXiv preprint arXiv:1607.01938},
year = {2017}
}