Resolution of Fine Structure in Ionization-Efficiency Curves

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Abstract
An energy‐distribution difference method for determining ionization potentials and for detecting fine structure, i.e., breaks, in ionization‐efficiency curves is described which eliminates the difficulties arising from the thermal‐energy spread of the ionizing electrons. Although the technique gives essentially the same results as monoenergetic methods, it is much easier experimentally. Ionization‐efficiency curves are given for the inert‐gas ions Ar+, Kr+, and Xe+ as well as the molecular ions CO+, N2+, and O2+. The ``breaks'' in the efficiency curves are presented and the results are compared to previously reported monoenergetic electron‐impact data.

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