Fermi edge correction

Use these procedures to derive a straight slit correction from a measured metal reference and apply it in ImageTool Manager. Use the correction only for measurements for which the same detector correction is valid. This normally requires the same analyzer configuration, lens mode, pass energy, and detector coordinate definition.

Fermi edge correction in the GUI is performed with goldtool.

For the corresponding Python workflow, see Fermi edge correction.

Fitting a Fermi edge from a reference measurement

1. Open the reference spectrum in Manager. Double-click its row to show its ImageTool window.

2. Right-click the main image and select goldtool.

3. Resize the ROI to choose a suitable angle and energy window around the Fermi edge.

4. Enter the measured temperature in T (K) and the energy-resolution FWHM in Resolution. Different toggles control the input parameters to erlab.analysis.gold.edge().

5. Select Go to start the fitting procedure. Badly conditioned fits are automatically excluded from the results.

6. Select Polynomial or Spline and inspect the fitted edge.

7. You can view the fitted edge using Open edge in ImageTool. To use this edge to correct another measurement, see Correction of another measurement.

Correction of another measurement

1. In goldtool, select the Polynomial or Spline tab that contains the accepted edge model.

2. Select Open edge in ImageTool. Manager adds the evaluated edge below goldtool.

3. In the ImageTool of the measurement you wish to correct, select Edit ‣ Shift….

4. Set Dimension to eV.

5. Set Shift Source to Existing ImageTool and select the edge ImageTool created by goldtool.

6. Keep Negate shift selected. Select Shift coordinates to retain the complete shifted energy range.

7. Set Result Placement to Open Child Window and select OK.

The corrected child records both the measured data and the fitted edge as inputs. If either input changes, Manager marks the result as stale.