a falsely assigned masses, leading to erroneous momentum values. Especially events where a single C${}^{+}$ instead of a CH${}^{+}$ is detected, could contaminate the depicted distributions.\

The three-dimensional representation (Figure \[fig:halothan\_305eV\_3D\_momenta\]) confirms the separation of enantiomers, with the ambiguous events clearly visible (marked by the gray ellipse). In this figure, momentum data (small spheres) are overlaid with a strucural model of the R- and S-enantiomer respectively. The transformation of the data into the molecular frame is chosen in a way that the CH${}^{+}$ points away from the spectator, defining the first axis of the molecular coordinate systems. The second axis of the molecular coordinate system is defined by the sum momentum of Cl${}^{+}$ and Br${}^{+}$.\

Information on the absolute configuration can also be obtained from fragmentation pathways involving neutral dissociation products, as long as suitable ionic fragments are detected [@Pitzer2016]. For these ’incomplete’ break-ups, the assignment of masses becomes ambiguous: First, the isotopes of chlorine and bromine can no longer be separated; second, a contribution from C${}^{+}$ ions contaminates the CH${}^{+}$ data. Due to the high field used in the setup, the wrong mass assignment leads to errors of around 100 atomic units (a. u.) in the momenta of the 