Abstract
Recently, Coolbaugh, Peifer and Garvey reported the observation that the mass spectral peaks attributed to doubly charged NH 3 clusters (produced by electron impact ionization) are each composed of seven individual peaks. Two smaller peaks to the left of the parent peak (NH 3) n 2+ were explained as being due to unimolecular fragmentation processes within such parent ions. Previous ionization threshold law measurements and other arguments, however, suggest that these ions are formed by prompt dissociative ionization processes during the primary ionization process.
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