Abstract
Mass spectra of the ion fragment patterns produced by the ionization of large organic molecules by slow positrons have been recorded. Three ranges of positron energies have been studied: (1) 3000 ev, (2) the Ore gap range, (3) energies below the Ore gap. Fragmentation patterns produced by 300 eV positrons are very similar to those produced by 2700 eV electrons. Ionization by positronium formation appears to be a universal mechanism for all molecules. Ionization occurs for positrons having energies below the Ore gap, but the mechanism is not fully elucidated at this time. 14 refs., 8 figs.
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