Seminars Archive

The CiPo beamline – magnetic and natural circular dichroism

Abstract
The Circularly Polarised beamline is in operation since 2002 and it is managed by the ISM-CNR. The beamline produces circularly polarized radiation in the VUV-Soft-X ray energy range (5-800 eV). The source is an electromagnetic undulator/wiggler, allowing a 0.05-0.1 Hz helicity switching mode to improve significantly the signal to noise ratio for dichroism. The research activity of the beamline is focused on XAS-XMCD in the Soft-X-Ray energy range and on PES in the VUV range. In particular the research group is active in the field of the circular dichroism in photoelectron spectroscopy (PECD). The natural circular dichroism in photoemission is a new technique in characterising the electronic properties of chiral molecules; using a circularly polarised synchrotron radiation source it is possible to couple the information of the molecular electronic states with the chiral properties of the molecule. The PECD spectroscopy has a wide range of applications: it is sensitive to molecular conformers, electronic orbital character and electron correlation. The presentation will illustrate the main activities, collaborations and future developments of the beamline.