Abstract
Measurements were made for ionization and dissociative ionization cross sections of O2 and N2 in collisions with 2–10keV protons. Cross sections were measured for both target gases employing the time of flight mass spectroscopy for the slow target molecular ions and ionic fragments. Measured cross sections were found to connect very well with previously measured data. Ionization was found to be dominant and 5 times higher than dissociative ionization in the case of O2 and 10 times in the case ofN2. Pronounced structure around 5keV was attributed to the transition between the initial and final states of the system as well as from quantum or classical effect involving the attractive and repulsive parts of the potential energy curves of N2 and O2. The present data add to the present available data and confirm previously measured total cross sections.
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