1 Department of Physics and Astronomy, Faculty of Science, Aarhus University, Aarhus University2 Interdisciplinary Nanoscience Center, Faculty of Science, Aarhus University, Aarhus University3 Stereological Research Laboratory, Faculty of Health Sciences, Aarhus University, Aarhus University4 Department of Clinical Medicine - Stereological Research Laboratory, Department of Clinical Medicine, Health, Aarhus University5 Department of Physics and Astronomy, Science and Technology, Aarhus University6 Department of Clinical Medicine - Stereological Research Laboratory, Department of Clinical Medicine, Health, Aarhus University7 Department of Physics and Astronomy, Science and Technology, Aarhus University
A setup for femtosecond time-resolved photoelectron spectroscopy of solid surfaces is presented. The photon energies for core-level spectroscopy experiments are created by high-order harmonic generation from infrared 120-femtosecond laser pulses focused in a Ne gas jet. The present experimental realization allows the sample, located in an ultrahigh-vacuum chamber, to be illuminated by 106 65-eV photons per laser pulse at a 10 Hz repetition rate. The spectral width of a single harmonic is 0.77 eV (FWHM), and a few harmonics are selected by specially designed Mo/Si multi-layer mirrors. Photoelectrons from the sample are collected by a large-solid-angle time-of-flight electron spectrometer based on a parabolic-grid reflector. Results from experiments probing the Bi 5d core-levels are presented, and the results of preliminary pump-probe experiments are described.
Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 2010, Vol 615, Issue 1, p. 114-126