Determination of peak onset position in photomission spectroscopy data of the Highest occupied molecular orbital state of organic semiconductors.

Requirement :

• pyarpes: https://arpes.readthedocs.io/en/latest/
• xarray: https://docs.xarray.dev/en/stable/
• implementation of whittaker smoother from: https://github.com/WFP-VAM/vam.whittaker

For more information on peak onset see this paper:

Krause, S., Casu, M. B., Schöll, A. & Umbach, E. Determination of transport levels of organic semiconductors by UPS and IPS. New J. Phys. 10, 085001 (2008). doi:10.1088/1367-2630/10/8/085001