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Ultrafast electron spectroscopy at liquid interfaces


Ultrafast electron spectroscopy at liquid interfaces

B. Abel1,2*

1Leibniz Institute of Surface Modification (IOM) Chemical Department Permoserstr. 15, D-04318 Leipzig, Germany

2Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry Linnéstr. 3, D-04103 Leipzig, Germany

For decades, ESCA or PES (termed XPS, for X-ray photoelectron spectroscopy, in the case of soft X-ray photons) was restricted to conventional laboratory X-ray sources or beamlines in synchrotron facilities. This approach enabled frequency domain measurements, but with poor time resolution. Indirect access to time-resolved processes in the condensed phase was only achieved if line-widths could be analyzed or if processes could be related to a fast clock, that is, reference processes that are fast enough and are also well understood in the condensed phase. Just recently, the emergence of high harmonic light sources, providing short-wavelength radiation in ultrashort light pulses, added the dimension of time to the classical ESCA or XPS technique and opened the door to (soft) X-ray photoelectron spectroscopy with ultrahigh time resolution. The combination of high harmonic light sources (providing radiation with laser like beam qualities) and liquid microjet technology recently enabled the first liquid interface PES experiments in the IR/UV-pump and extreme ultraviolet-probe (EUVprobe) configuration. In the talk different features of the technology and a number of recent applications involving solvation phenomena near water and protic solvent interfaces will be highlighted.


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