Artemis (link opens in a new window) is an ultrafast soft x-ray science facility based on high repetition rate, few optical cycle and tuneable laser sources, and ultra-fast XUV (10-100 eV) pulses produced through high harmonic generation. Vacuum beamlines deliver the synchronised pulses to end-stations for condensed matter physics and gas-phase chemistry. Artemis combines femtosecond laser and synchrotron technologies to enable new science in this emerging field.
Experiments on Artemis exploit high harmonic generation to investigate ultrafast dynamics in experiments on gas, liquid and solid materials. A key technique used on Artemis is time and angle resolved photoemission spectroscopy, which enables the electronic structure of a material to be monitored as it responds to excitation by a laser pulse. The target material is irradiated by a short laser pulse, which induces structural changes and excitations. It is then probed at a series of time delays by a short wavelength pulse which generates photoelectrons that are then collected and analysed.
The Artemis beamline is one of the first in the world to use XUV pulses from high-order laser harmonics, with 20 eV photon energy and 30 femtosecond time resolution. The higher photon energy enables electrons with a much wider range of energy and momentum space to be detected, meaning that each snapshot of electronic structure has a much wider field of view.
Other applications of XUV pulses on Artemis include high harmonic generation spectroscopy, photoelectron spectroscopy with XUV probe pulses, studies of autoionisation dynamics and ultrafast demagnetisation.