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We report on the design and performance of a double-sided coincidencevelocity map imaging spectrometer optimized for electron-ion and ion-ioncoincidence experiments studying inner-shell photoionization of gas-phasemolecules with soft X-ray synchrotron radiation. The apparatus employs twomicrochannel plate detectors equipped with delay-line anodes for coincident,time- and position-resolved detection of photo- and Auger electrons withkinetic energies up to 300\,eV on one side of the spectrometer and photoions upto 25\,eV per unit charge on the opposite side. We demonstrate its capabilitiesby measuring valence photoelectron and ion spectra of neon and nitrogen, and bystudying channel-resolved photoelectron and Auger spectra along withfragment-ion momentum correlations for chlorine $2p$ inner-shell ionization of\textit{cis}- and \textit{trans}-1,2-dichloroethene.

A Coincidence Velocity Map Imaging Spectrometer for Ions and High-Energy Electrons to Study Inner-Shell Photoionization of Gas-Phase Molecules