Software for IRIS/OSIRIS data analysis
17 Oct 2008



The main software package used to analyse data from IRIS and OSIRIS is Mantid. It is a free GUI and script based software available to download.




Mantid handles data from both IRIS and OSIRIS, and performs both Data Reduction and Data Analysis. It can be downloaded from here

Mantid QENS manual can be accessed here.

Data Reduction involves converting measured time-of-flight (tof) data into S(Q,ω). Operations include:

  •  Converting from tof to energy transfer 
  •  Summing of spectra into groups and converting from detector angle to Q-value
  •  Absorption, empty cell and multiple scattering corrections (if necessary)

Data Analysis refers to science-based interpretation of the reduced data. Operations include:

  • Calculating mean square displacements from elastic window scan measurements  
  • Fitting QE peaks after convoluting with the resolution spectrum
  •  Calculating peak parameters using Bayesian analysis
  •  Fitting peak widths to diff​usion/rotation models
  •  Performing Fourier Transformation of S(Q,ω) to I(Q,t)
  •  Fitting scattering functions to stretched exponential decays  

In addition to Mantid, other packages that can be used to analyse data from IRIS are:

  • DAVE
  • MSLICE (see manual)
  • Modes (in OpenGenie. Now with minimal support & no more developments.)

Note on OSIRIS Diffraction:

To analyse diffraction patters taken on OSIRIS, user either Mantid or ARIEL.