SYSTEM FOR TIME-RESOLVED AND ANGLE-RESOLVED PHOTOELECTRON-SPECTROSCOPY BASED ON AN AMPLIFIED FEMTOSECOND TITANIUM-SAPPHIRE LASER SYSTEM

A system for time- and angle-resolved photoelectron spectroscopy based on an amplified femtosecond titanium:sapphire laser system is describ ed. Using this type of system, angle-resolved photoemission is extende d to include the possibility of following the time development of exci ted electrons at and near a solid surface. Time resolution is accompli shed by using pump-and-probe technique and the photoemitted electrons are energy analyzed in a time-of-fight detector. In order to perform p hotoemission, the near-infrared light from the titanium:sapphire laser is frequency up-converted to the vacuum ultraviolet range. This is ac complished by using the high peak power pulses from the laser system t o produce short-wavelength radiation by means of harmonic generation. The system described uses cascaded frequency doubling and tripling, re aching a photon energy close to 10 eV. (C) 1996 American Institute of Physics.