The Rietveld method
                        
                        
                            Albinati, A. and 
Willis, B. T. M., 
                        
                        
                                        
                                            International Tables for Crystallography
                                         (2006). 
                                         
                                            Vol. C,
                                            
                                                            
                                                                        ch. 8.6,
                                                            
                                                            
                                                                pp. 710-712
                                                                        
                                            
                                        
                        
                        
[ doi:10.1107/97809553602060000614 ]
                        source   gives an asymmetrical line shape arising from the fast rise and slow decay of the neutron pulse: this shape can be approximated by a pair of exponential functions convoluted with a Gaussian (
Albinati & Willis, 1982      ; Von Dreele, Jorgensen ...
                            
                            
                            
                            
                    
                        
                            Indexing
                        
                        
                            Albinati, A. and 
Willis, B. T. M., 
                        
                        
                                        
                                            International Tables for Crystallography
                                         (2006). 
                                         
                                            Vol. C,
                                            
                                                            
                                                                Section 8.6.2.1,
                                                                    
                                                            
                                                                pp. 711-711
                                                                        
                                            
                                        
                        
                        
[ doi:10.1107/97809553602060000614 ]
                        
                            
                                     [
more
                                    results from section 8.6.2 in volume C]
                            
                            
                            
                            
                    
                        
                            Basic theory
                        
                        
                            Albinati, A. and 
Willis, B. T. M., 
                        
                        
                                        
                                            International Tables for Crystallography
                                         (2006). 
                                         
                                            Vol. C,
                                            
                                                            
                                                                Section 8.6.1,
                                                                    
                                                            
                                                                pp. 710-711
                                                                        
                                            
                                        
                        
                        
[ doi:10.1107/97809553602060000614 ]