4.6 GEMSQRAW: I2T

The program I2T is intended to Fourier transform diffraction data to obtain the pair distribution function:

The input workspace should contain the distinct scattering i(Q). In practice the input should be on a Q-axis and should oscillate about a value of zero - subtract a suitable constant from your data to achieve this. 

If a workspace called data contains i(Q) then its Fourier transform may be calculated by typing this: 

ft=i2t(data) 

This will put T(r) (or D(r)=T(r)-T⁰(r) ) into the workspace called ft.

It is not necessary for the input workspace to be put on a constant delta-Q scale. However, should you wish to do this then use a command like the following example...

data=rebin:linear(data,3.0,0.05,30.0) 

Last updated on 18 Sep 2002 by Alex Hannon (a.c.hannon@rl.ac.uk)