see also:

cold target recoil-ion momentum spectroscopy, corresponding experimental setups are often called reaction microscopes, as well

Cold target recoil-ion momentum spectroscopy is a momentum imaging technique used to measure the complete fragmentation of an atomic or molecular few-body system. All charged fragments from an atomic, molecular, or surface reaction are projected onto large area position- and time-sensitive detectors. By measuring the individual particles’ times-of-flight and positions of impact on the detector, their 3D- momentum vectors are deduced. COLTRIMS measurements are coincidence measurements as many final-state fragments of single molecules or atoms are detected. Typical setups include a supersonic gas jet (i.e. molecular beam) as a target for the investigations and multi-hit capable MCP detectors with delay line position-readout for single particle detection.