Running I2T to Fourier Transform the Data   

Once a final corrected, combined diffraction pattern has been obtained, there are many approaches that may be used to analyse and interpret the result. The data may be Fourier transformed to yield a real-space correlation function. The GENIE program I2T has been provided to perform such a Fourier transformation, and the associated calculations. To run this program type @g_f:i2t in GENIE. Before running the program you should read a distinct scattering, i(Q), curve into a workspace (e.g. from a .SOQ file).

Low-Q extrapolation 

If the data in the i(Q) curve start at a minimum Q which is greater than zero (or delta-Q) then I2T extrapolates the data down to Q=0 with a horizontal line. A more sophisticated extrapolation may be performed by using the GENIE transform g_f:lowq (i.e type tr w1 g_f:lowq w2 in GENIE) which extrapolates the data using a quadratic A+BQ². This program should be run before running I2T.

Last updated on 08 Apr 2002 by Alex Hannon (a.c.hannon@rl.ac.uk)