Photoemission spectroscopy (PES), refers to energy and momentum measurement of electrons emitted from solids thanks to the use of photons. The ionization energy is provided by XUV (PES or ARPES) or EUV (2PPES), while the pump is usually provided by an OPA.
ARPES is used to map the complete electronic band structure for conductors and insulators, among others. Time- and angle-resolved photoemission spectroscopy (TR-ARPES), adds femtosecond temporal resolution, and thus also resolves elementary scattering processes in the electronic band structure.
To avoid space charge problems (electrons repealing each other), one electron or less should be produced and analyzed per laser shot. The application thus requires moderate energy high rep rate sources, and a complete measurement typically lasts 4h at 200kHz.
Amplitude range of Ytterbium lasers, such as the SatsumaX and the Tangor 100 are ideal driving sources for this application. Additional modules such as COMPRESS and HHG chamber, combined with Fastlite twinStarzz MIR OPA, are state of the arts devices allowing to build a unique TR-ARPES setup from a single supplier.
