Abstract
The velocity dependence of the total Penning ionization cross sections,σ(v), is measured in the thermal relative velocity region, using a time of flight method.σ(v) curves are reported for the collision systems He(21 S)/Ar, Kr, Xe, N2, Hg, He(23 S)/Ar, Kr, Xe, N2, Hg, Ne(3 P 2, 0)/Kr, Hg, and Ar(3 P 2, 0)/Hg.
In a qualitative discussion it is shown that all features of the measuredσ(v) curves may be explained within the frame of the theory of Penning ionization, allowing to extract information on the physical quantities governing the process: on the interaction potentialV(R) and on the transition probabilityW(R). A theoretical calculation for the He(23 S)/Ar system shows good agreement with our experimentalσ(v) curve.
On the basis of the present results earlier data onσ(v), and on absolute cross sections and rate constants obtained at certain relative velocity distributions are discussed.
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Illenberger, E., Niehaus, A. Velocity dependence of total Penning ionization cross sections. Z Physik B 20, 33–41 (1975). https://doi.org/10.1007/BF01313908
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DOI: https://doi.org/10.1007/BF01313908