Dear Colleagues,

Photoelectron spectroscopy utilizes photo-ionization and subsequent analysis of the kinetic energy distribution of the ejected electrons to study the electronic structure of molecules; in the gas phase, on clusters and on surfaces. It may even be used to study molecules in solution, by solvating them in clusters or in liquid jets crossing a vacuum chamber. Combining photoelectron spectroscopy with pump-probe time resolved techniques has allowed us to follow the changes in electronic structure driven by nuclear motion as an electronically excited state relaxes and transforms electronic energy into heat and work. These studies have highlighted the importance and ubiquity of non-adiabatic interactions in photochemistry and have had significant impact on our understanding of the general mechanisms acting in photobiology, photosynthesis and vision. Angular resolution of the photoelectron distribution, particularly from aligned molecular samples or chiral molecules, reveals interference patterns that provide detailed information on the electronic structure. In the very strong laser fields of ultrashort optical pulses molecules exhibit interesting physics such as above threshold and field ionization. The subsequent recollision of the photoejected electron with the ion core as the optical field reverses its sign leads to effects such as high harmonic generation which can, with certain assumptions, be used to tomographically reconstruct the electronic wavefunction. The objective of this special issue of Molecules is to highlight the latest advances in the exploration and application of all aspects of photoelectron spectroscopy.

Prof. Dr. J Benjamin C Whitaker
Guest Editor

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• photoelectron spectroscopy
• electronic structure
• molecular wavefunctions
• non-adiabatic interactions
• TRPES (time resolved photoelectron spectroscopy)
• velocity map imaging
• electron detachment