Time-resolved Photoemission Spectroscopy
Time-resolved Photoemmision Spectroscopy is an important extension to Photoemission spectroscopy. This method also employs a pump-probe setup. In most cases the pump and probe are both generated by a pulsed laser and in the UV region. The pump excites the atom or molecule of interest, and the probe ionizes it. The electrons or positive ions resulting from this event are then detected. As the time delay between the pump and the probe are changed, the change in the energy (and sometimes emission direction) of the photo-products is observed. In some cases multiple photons of a lower energy are used as the ionizing probe.
Read more about this topic: Time-resolved Spectroscopy