The Circular Polarization beamline (CiPo) is characterized by its capability of providing a Synchrotron Radiation Beam of variable polarization (Circular to Linear) in a very broad range of photon energies, 5 to 900 eV. The photon beam is produced by an Electromagnetic Elliptical Wiggler and is dispersed by means of two collinear monochromators, a Normal Incidence Monochromator (NIM) and a Spherical Grating Monochromator (SGM), that alternatively provide two beams in the UV-VUV (5 - 40 eV) and soft X-rays (40 - 900 eV) respectively. The availability of such a wide photon energy spectrum, together with the polarization selection makes the CiPo beamline extremely flexible for the experimental activity. The CiPO Beamline itself can be considered a research instruments that can be coupled with other experimental instrumentation that ,taking advantage from photons with variable and well defined energy and polarization available for sample excitation, analyze the following response improving their capability. Photoemission techniques such as XPS,UPS, PECD, TEY developed a lot with respect to the laboratory equippments as well as Photoionization Mass Spectrometry and Core level Absorption Spectroscopy (XAS, NEXAFX, XMCD, XNCD, etc.)
Several equipments are available for performing different type of experiments:
- Core Level Absorption spectroscopy from solid surfaces, thin films and molecules (XAS) and, taking advantage of circular polarization, measurement of the X-Ray Magnetic Circular Dichroism (XMCD) of magnetic films and low-dimensional systems result as the primary scientific research field. Absorption techniques are performed at variable temperature and Magnetic field.
- XPS/UPS Photoemission UHV chamber for investigation of clean and dosed sample surfaces “in situ” prepared and characterized.
The CiPo Beamline gives also the possibility to perform gas phase experiments on atomic and molecular systems, in particular Photoelectron Circular Dichroism (PECD) on chiral molecules.
- Mass Analysis Photoionization and photofragmentation setup for studying mass spectra, photoionization efficiency curves and kinetics of ion-molecule reactions of molecules in gas phase.