Open AccessUnraveling Atomic and Electronic Surface Structure and Dynamics from Angular Photoelectron Distributions
Author(s) -
Matthias Hengsberger,
Luca Castiglioni,
Jürg Osterwalder
Publication year - 2022
Publication title -
chimia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.387
H-Index - 55
eISSN - 2673-2424
pISSN - 0009-4293
DOI - 10.2533/chimia.2022.558
Subject(s) - angle resolved photoemission spectroscopy , femtosecond , x ray photoelectron spectroscopy , angular resolution (graph drawing) , photoemission spectroscopy , electronic structure , angular momentum , atomic orbital , diffraction , atomic physics , computational physics , physics , optics , condensed matter physics , laser , electron , nuclear magnetic resonance , quantum mechanics , mathematics , combinatorics
Angle-resolved photoelectron spectroscopy (ARPES) is a powerful tool in solid state sciences. Beside the direct measurement of the energy-momentum dispersion relation, the angular distribution of the photoelectron current reveals the structural environment of the emitting atoms via photoelectron diffraction effects. Moreover, in the case of molecular layers, the angular distribution of emission from molecular orbitals can be directly related to their charge density distribution via so-called orbital tomography. In the present paper we summarize our efforts undertaken over the past 12 years to add the dimension of time to these two methods via pump-probe experiments with femtosecond resolution. We give a comprehensive introduction to standard ARPES and time-resolved two photon photoemission and then focus on our efforts towards time-resolved versions of photoelectron diffraction and orbital tomography. Both, optimization of experimental parameters and data acquisition procedures, as well as new numerical tools are needed in order to realize such challenging full stop missing after experiments.