SAD/MAD experiments

Start program for fluorescence detector

• Open a window on pc5080


• type: Rontec

Take a fluorescence spectrum

• Choose your element and move with the "+20eV" button to the desired energy.


• Press "Take Data" button to record a first fluorescence spectrum.


• Check whether the peaks are at the expected positions.


• Use the filters in order to prevent saturation.


• The dead time percentage should read well below 0.20.

Perform the fluorescence scan

• Autochooch will suggest the energies for the peak and inflection point.
  It is recommendend start the SAD/MAD with the peak wavelength,
  which has to be set in the IDL window with the command sete, value .
  


• Return to data acquisition software and start the data collection.


• For the high-energy remote increase the energy by 100 -- 1000 eV.


• Inverse-beam data collection.

Useful links

• X-ray anomalous scattering pages at University of Washington
  (theory, tables, chart of absorption edges, ...)


• Heavy Atom Databank