Profile Parameters Refinement Dialog

 

Exponential decay

 

 

 

Parameters defining the variation of the exponential decay function with d-spacing.

 

For NPRO=9

Fast decay:   

 

Slow decay:  

 

For NPRO=10,

The parameters  correspond to the epithermal and thermal component of the neutron spectrum. In this case the TOF peak positions and decay parameters versus d-pacing are calculated using the following expressions:

 

                                                         

 

where:

 

 

                                                                         

 

                                                               

 

and erfc is the complementary error function.

 

 

Fast and slow decay for epithermal component:

 

                                                                                

 

                                                                               

 

Fast and slow decay for thermal component:

 

                                                                                 

 

                                                                                 

 

The final fast and slow decay parameters are calculated like the case of TOF peak positions:

 

                                                                   

 

                                                                  

 

 

Colour notes