A new technique for measuring positron impact direct ionisation
Date
2017
Authors
Machacek, Joshua
Babij, Tamara
Murtagh, Daniel
Buckman, Stephen
Sullivan, James
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Publisher
Springer
Abstract
We present a method for measuring the electron yield in positron impact direct ionisation of atomic or molecular targets using a magnetically confined positron beam. This method can be used to determine the (relative) direct ionisation cross section. The use of this technique and a Surko trap based positron beam allows the electron yield to be measured at impact energies as low as 100 meV above the direct ionisation threshold. Application of this technique to the measurement of the energy dependence of the direct ionisation cross section near threshold is also discussed.
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Source
European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics
Type
Journal article
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2099-12-31