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Sotware for IRIS/OSIRIS data analysis

The main software package used to analyse data from IRIS and OSIRIS is MODES. It is free Gui-based package written in OpenGenie and developed in-house.

MODES handles data from QENS instruments such as IRIS and OSIRIS, and performs both Data Reduction and Data Analysis. 

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

  •  Converting from tof to energy transfer (or other units eg. d-spacing
  •  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:

  •  Fitting QE peaks using the convolution method
  •  Calculating peak parameters using Bayesian analysis
  •  Fitting peak widths to diffusion/rotation models
  •  Performing Fourier Transformation of S(Q,ω) to I(Q,t)
  •  Fitting scattering functions to stretched exponential decays  

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

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