Investigating Molecular-Frame Compton Electron Angular Distributions in CO

We propose to investigate Compton scattering in the molecule CO. Using our COLTRIMS reaction microscope, a powerful custom-built end-station that we bring to ESRF for each beam time, we aim to measure the first-ever molecular-frame Compton electron angular distributions (MFCADs) for heteronuclear molecules. Such molecular-frame electron angular distributions mirror the intricate process of multiple scattering of electrons in a molecular potential. They are thoroughly investigated for ionization by photoabsorption (MFPADs), which is restricted by dipole selection rules, but have never been measured for ionization by Compton scattering, where they are expected to be much richer, as no selection rules are present.