kaneod
commented
1 year ago Hi,I’m afraid I can’t remember! I’ve been out of physics for going on 8 years now and that codebase has no active input - I only kept it up because some friends of mine in the UK occasionally use bits of it.If I reach into the dark past and try to drag up some knowledge I vaguely recall the fermi level being used because it’s the common zero energy level between the sample and the analyser (ie the electrical equilibrium). If you want the spectrometer vacuum level you need to know the spectrometer work function. Having said that, there was always in real analysers a parameter called the analyser work function that acted as a calibration factor (given that generally the kinetic energies in XPS are very high and the workfunction is small, this is a small correction). The textbook of choice in the field is probably Cardona & Ley, I used to know Lothar Ley very well and he is a magnificent communicator. On 22 May 2023, at 00:19, Julian-Hochhaus @.***> wrote: Hi, As it is not defined in ISO 14976, I wonder a bit why you assumed that kinetic energies are given with respect to the fermi edge. I am working with software that is using your vamas.py (LG4X) and LG4X-V2 and am not experienced with the .vms file format. Is it common to give the kinetic energies in .vms with respect to Fermi level? I would have expected to always measure kinetic energies with respect to spectrometer's vacuum level because that's where the energy is measured.
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Hi, As it is not defined in ISO 14976, I wonder a bit why you assumed that kinetic energies are given with respect to the fermi edge. I am working with software that is using your vamas.py (LG4X) and LG4X-V2 and am not experienced with the .vms file format. Is it common to give the kinetic energies in .vms with respect to Fermi level? I would have expected to always measure kinetic energies with respect to spectrometer's vacuum level because that's where the energy is measured.