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Neutral hydrogen clusters are grown in ultracold helium nanodroplets by successive pickup of hydrogen molecules. Even-numbered hydrogen cluster cations are observed upon electron-impact ionization with and without attached helium atoms and in addition to the familiar odd-numbered H n + . The helium matrix affects the fragmentation dynamics that usually lead to the formation of overwhelmingly odd-numbered H n + . The use of high-resolution mass spectrometry allows the unambiguous identificationdoi:10.1063/1.3035833 pmid:19071915 fatcat:5qgqltfrwbflberl6qz6wu6ys4