Time-of-flight analysis of dissociation products from collisions of 40 MeV Ar 13+ with molecular oxygen

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The time-of-flight spectrum of low energy ions produced in collisions of 40 MeV Ar 13+ with molecular oxygen contains peaks for O 2+, O 3+, and O 4+ which are split into doublets. This double-peak structure is presumed to reflect the flight time separation between ions with initial velocity vectors in opposite directions relative to the accelerating electric field. This paper presents the results of an analytical investigation of the time-of-flight distributions predicted for O 2+ and O 3+ ions using several different source geometries.