by the ion side of the spectrometer enabled a $4\pi$ solid angle for electrons up to a kinetic energy of 35 eV. For this reason, no magnetic field was needed to confine the electron trajectories within the spectrometer. One drawback of this configuration is the reduced time-of-flight spread of the electrons, and in conjunction a poor momentum resolution along the spectrometer axis. For low-energy electrons, the good momentum resolution in the detector plane ($\Delta p \approx 0.01$ atomic units) still allows the precise determination of the electron energy and the investigation of forward-backward asymmetries in the detector plane, i.e. along the photon propagation direction. High-energy electrons, however, have a smaller acceptance angle and are mostly recorded with momenta along the spectrometer axis where the uncertainty is around 0.4 atomic units of momentum. In the case of 80 eV electrons, this leads to an experimental broadening of about 25 eV.

Results and discussion
======================

Determination of configuration and distinction of enantiomers
-------------------------------------------------------------

Similar to the previous experiments, the focus was laid first on fragmentation pathways without neutral dissociation products. In this case, at least four ions need to be detected to distinguish enantiomers and to determine the absolute configuration. For halothane 