from Sigma-Aldrich as a racemate (a mixture containing equal amounts of the two enantiomers) and used without further treatment. Before entering the interaction zone, the jet was collimated by two skimmers (0.3 mm diameter each). A gas recycling system with cold traps in the vacuum foreline was used to reduce sample consumption.\
In most COLTRIMS-experiments, the electrostatic field in the spectrometer is very low (a few V/cm) in order to obtain good momentum resolution. Additionally, the ion arm of the COLTRIMS analyzer is typically very short in order to observe all fragments from a Coulomb explosion with 4$\pi$ solid angle [@Jahnke2004]. This, however, entails a large overlap in the time-of-flight regions of different ion masses. When all fragment ions are detected in coincidence, the correct masses can nevertheless be assigned by checking if the calculated momenta of all the fragments add up to zero.\
The more complex a molecule is, the higher the probability that the fragmentation produces neutral fragments which our detector is blind to. This implies that the total momentum of the measured ions does not add up to zero and thus prevents the unambiguous identification of the charged fragments as well. This is especially relevant for the 