DELIA (Dispersive Exafs caLIbration and Analysis)

Module characteristics

Example of use

 

The DELIA analysis is done in four main steps, Each step is implemented in a different panel in the main window: Raw, mu(E), chi(k) and Fourier. You should pass from one panel to the next one after completing the operations in the current one. The names are self explanatory:

  1. Phase I [Raw]: allows to read raw data, visualize the individual spectra, overplot them. You may use the buton for loading an example data.


    You may export one of them for calibration.
  2. Phase II [mu(E)]: Interpolation and Calibration. It allows the user to input the parameters. Default parameters for the interpolation limits are presented. The minimum correspond to maximum value between all the abscissas spectra minima, and the maximum corresponds to the minimum between all abscissas maxima. They may be changed by the user. The user should also supply the calibrating coefficients a,b,c. By using the button, the XAID_CALIB application is started to help in finding the coefficients. The coefficients found in this way are automatically transferred to the DELIA window. Once all parameters are filled, press the button to make calculations over all spectra. The results appear in the "Result:" text window and also in a newly created XPlot window. The results can be visualized or exported using the "Plot results"  buttons.




  3. Phase III [chi(k)]: extraction of the XAFS signal, i.e., calculate Chi(k) from Mu(Energy) over all the spectra. For selecting the appropriate parameters for the extraction, the user must perform interactively the extraction on a single spectrum (select its index and then press the Go button to start XAID_MU2CHI module. The parameters of the extraction are copied automatically to their respective boxes.



  4. Phase IV [Fourier]: Fourier transform and filtering. As in the previous phase, the user must first perform the Fourier Filtering on a single Chi(k) spectrum, by using the XAID_FF module. The parameters are copied automatically.