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Modern momentum imaging techniques allow for the investigation of complexmolecules in the gas phase by detection of several fragment ions incoincidence. For these studies, it is of great importance that thesingle-particle detection efficiency e is as high as possible, as the overallefficiency scales with e over n, i.e. the power of the number of detectedparticles. Here we present measured absolute detection efficiencies for protonsof several micro-channel plates (MCPs), including efficiency enhanced "funnelMCPs". Furthermore, the relative detection efficiency for two-, three-, four-,and five-body fragmentation of CHBrClF has been examined. The "funnel" MCPsexhibit an efficiency of approx. 90 percent, gaining a factor of 24 (ascompared to "normal" MCPs) in case of a five-fold ion coincidence detection.

Absolute ion detection efficiencies of microchannel plates and funnel microchannel plates for multi-coincidence detection