The SAPÊ Group is responsible for the management and operation of the SAPÊ beamline of the synchrotron light source Sirius, at the Brazilian Synchrotron Light Laboratory (LNLS).

The SAPÊ beamline will be dedicated to Angle Resolved Photo Emission Spectroscopy (ARPES), which is one of the most powerful methods for studying the electronic structure of solids. It allows, via photoelectric effect, to measure the energy distribution and momentum of electrons ejected from the surface of a solid irradiated with ultraviolet light. The released electrons carry detailed information about the possible quantum states of electrons in the material (the so-called band structure), and even about dispersion processes and interactions with other excitations, allowing microscopic understanding of surprising electronic phenomena such as superconductivity.