Photoelectron Photoion Spectral Compendium


The PEPISCO database provides threshold photoelectron (TPE), photoion mass-selected threshold photoelectron (ms-TPE), photoelectron (PE) and photoionization (PI) spectra, to serve the valence photoionization community and users of vacuum ultraviolet beamlines around the globe. We compile experimental as well as simulated spectra with the goal to provide a compendium rich in metadata for photoionization experiments and analytical purposes.

Usage and feedback

The raw spectral data can be downloaded by clicking on the spectrum title. We are grateful for comments and corrections.


New contributions are much appreciated and will be included in the database promptly. Please use the PEPISCO_species Windows tool to compile spectra with species and reference information before submitting data to The user's manual can be found here: PEPISCO_species.pdf. A macOS version is in the making...


Please cite the original publication of each spectrum. Furthermore, we would be grateful if you could also cite the Photoelectron Photoion Spectral Compendium (J. Phys. Chem. C 127, 34, 16751–16763, 2023, DOI: 10.1021/acs.jpcc.3c03120).