  The photoelectron circular dichroism (PECD) of the O 1s-photoelectrons of
trifluoromethyloxirane(TFMOx) is studied experimentally and theoretically for
different photoelectron kinetic energies. The experiments were performed
employing circularly polarized synchrotron radiation and coincidentelectron and
fragment ion detection using Cold Target Recoil Ion Momentum Spectroscopy. The
corresponding calculations were performed by means of the Single Center method
within the relaxed-core Hartree-Fock approximation. We concentrate on the
energy dependence of the differential PECD of uniaxially oriented TFMOx
molecules, which is accessible through the employed coincident detection. We
also compare results for differential PECD of TFMOx to those obtained for the
equivalent fragmentation channel and similar photoelectron kinetic energy of
methyloxirane (MOx), studied in our previous work. Thereby, we investigate the
influence of the substitution of the methyl-group by the trifluoromethyl-group
at the chiral center on the molecular chiral response. Finally, the presently
obtained angular distribution parameters are compared to those available in
literature.

Chemical Physics;Atomic and Molecular Clusters