Modern momentum imaging techniques allow for the investigation of complex molecules in the gas phase by detection of several fragment ions in coincidence. For these studies, it is of great importance that the single-particle detection efficiency e is as high as possible, as the overall efficiency scales with e over n, i.e. the power of the number of detected particles. Here we present measured absolute detection efficiencies for protons of several micro-channel plates (MCPs), including efficiency enhanced "funnel MCPs". Furthermore, the relative detection efficiency for two-, three-, four-, and five-body fragmentation of CHBrClF has been examined. The "funnel" MCPs exhibit an efficiency of approx. 90 percent, gaining a factor of 24 (as compared to "normal" MCPs) in case of a five-fold ion coincidence detection.
@article{arxiv.1803.08380,
title = {Absolute ion detection efficiencies of microchannel plates and funnel microchannel plates for multi-coincidence detection},
author = {K. Fehre and D. Trojanowskaja and J. Gatzke and M. Kunitski and F. Trinter and S. Zeller and L. Ph. H. Schmidt and J. Stohner and R. Berger and A. Czasch and O. Jagutzki and T. Jahnke and R. Dörner and M. S. Schöffler},
journal= {arXiv preprint arXiv:1803.08380},
year = {2023}
}
Comments
8 pages, 7 figues, submitted to Review of Scientific Instruments