Synchrotron-radiation-based recoil ion momentum spectroscopy of laser cooled and trapped cesium atoms

We measured the recoil energy of ions after the ejection of a photoelectron using a time of flight spectrometer, synchrotron radiation as the ionization source and laser cooled Cesium atoms as the target. From the time of flight (TOF) spectra we extracted the asymmetry parameter. We show that the photoelectrons angular distribution for an open shell, one-electron atom with large mass such as Cesium, presents a dramatic dependence on photon energy caused by relativistic effects and interchannel coupling arising from final state configuration mixing. We also present the last measured results of recoil ion momentum spectroscopy for laser cooled and trapped Calcium atoms.