to larger molecules: Can the configuration be determined again on a single-molecule level for a molecule that consists not only of a single carbon center? How does the fragmentation dynamics change depending on which carbon atom is initially excited and can we use this to enhance relevant fragmentation channels for the determination of absolute configuration?\
Concerning the first question, results from our previous experiments show that molecular fragments (in contrast to atomic ions) can also be used for the determination of absolute configuration [@Pitzer2016]. A similar approach has been employed, for example, to extract the photodynamics of deuterated benzene from the momentum correlations of molecular fragments [@Matsuda2009].\
The second aspect, the interplay between selective excitation and fragmentation pathways has been investigated since the early days of synchrotron radiation and electron-ion coincidence spectroscopy [@Eberhardt1983]. Particularly interesting for the investigation of halothane is the observation by Habenicht et al. [@Habenicht1991] that the yield of CF${}_{3}^{+}$ from trifluoroethane (CF${}_{3}^{+}$CH${}_{3}^{+}$) increases significantly for excitation of the ’opposite’ carbon atom C${}_{\mathrm{H}}$. More recent experiments employ PEPIPICO-spectra (Photoelectron-Photoion-Photoion-Coincidence), e.g. to investigate the conditions for which site-specific fragmentation works best [@Nagaoka2011].

Methods
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The experiments were performed with a COLTRIMS-setup (Cold Target Recoil Ion Momentum Spectroscopy, [@doerner2000; 