in the given photon energy range, the break-up into the four ions CH${}^{+}$, Cl${}^{+}$, Br${}^{+}$, and CF${}_{3}^{+}$ was the only one that fulfilled all of the above criteria. This fragmentation pathway corresponds to one of the pathways identified for CHBrClF [@Pitzer2016], with a CF${}_{3}^{+}$ fragment instead of a single F${}^{+}$ ion. The break-up into the five ions H${}^{+}$, C${}^{+}$, Cl${}^{+}$, Br${}^{+}$, and CF${}_{3}^{+}$ was found with such small yield (around 100 events per isotopic combination) that the separation of peaks for the enantiomers could not be considered statistically significant.\

Figure \[fig:halothan\_305eV\_chirality\_parameter\] shows the chirality parameters $\cos(\theta_1) =
\vec{p}_\mathrm{CF_3}\cdot \left(\vec{p}_\mathrm{Cl}\times \vec{p}_\mathrm{Br}\right) (|\vec{p}_\mathrm{CF_3}||\vec{p}_\mathrm{Cl} \times\vec{p}_\mathrm{Br}|)^{-1}$ $\equiv \mathrm{CF_3} \cdot (\mathrm{Cl}\times\mathrm{Br})$ and $\cos(\theta_2) =\vec{p}_\mathrm{CH}\cdot \left(\vec{p}_\mathrm{Cl}\times \vec{p}_\mathrm{Br}\right) (|\vec{p}_\mathrm{CH}||\vec{p}_\mathrm{Cl} \times\vec{p}_\mathrm{Br}|)^{-1}$ $ \equiv \mathrm{CH} \cdot(\mathrm{Cl}\times\mathrm{Br})$ plotted against each other and the one-dimensional projections. A value of $\cos(\theta_1) > 0$ corresponds to an $R$-type configuration of momenta, $\cos(\theta_1) < 0$ to an $S$-type configuration. Despite a significant number of events in between, the two peaks for the enantiomers can clearly be separated. The origin of the events close to $\cos(\theta_i) = 0$ remains unclear. One possible explanation is a fragmentation behaviour that differs from the supposed ’instantaneous’ Coulomb repulsion of the ions. Another reason could be random coincidences or 