ResPES post-processing

Making Reference wave for aligning

Introduction

Automatic peak fitting in KolXPD software is the most accurate way to prepare the reference wave for aligning ResPES spectra. The reference wave can be created from the peak positions of a core-level which was acquired simultaneously with the valence band region after each photon energy step.

Tips and tricks

• If the core-level was not measured, an analogous procedure can be applied on a shallow core-level in the valence band region or on the Fermi edge. Energy range borders must be adjusted accordingly in such cases.
• In some cases, a sufficienlty accurate reference wave can be easily created using the Calculate reference built-in function of the Matrix operations panel (Igor Pro, XPS utilities menu)
• The reference wave can be also created using the Wavemetrics built-in Batch Curve Fitting... package (Analysis -> Packages).

How it works

1. In KolXPD, open txt file with your ResPES spectra.
2. Select a core level region which was acquired simultaneosly with the valence band region after each photon energy step.
3. Select all core level spectra A and choose Fit all items... C from the Menu ring button B.

4. Make a reasonably good fit, then try to fix as much fitting parameters as possible, D. apart from the background, amplitudes and one peak position. If you have more than one peak, fix the relative peak positions to the one peak position, which will be left free.
5. Copy fit to other regions and press Fit all button E.

6. Then click on the peak position parameter which was left free F and choose Export selected parameter... G from the Menu ring button.
7. When save dialog window appears save the fitted peak positions as an itx file, which will be used as the reference wave for the aligning.