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In 2003, Dr Reddish began collaborating with Dr Bill McConkey,
Professor Emeritus at Windsor, in the area of trapping atoms for collision
and spectroscopy experiments. We have an electron beam of a chosen energy
(20-400eV) intersecting with ultra-cold cesium in a MOT and the resulting
trap loss is monitored by fluorescence techniques. Absolute total scattering
cross sections from the ground and laser-selected excited states have been
measured* [ MacAskill et al (2002) J Elec. Spec. Rel. Phenom. 123
173.] The findings of these on-going experiments are being compared with
the well-known Converged Close Coupling (CCC) calculations of our Australian
collaborator, Igor Bray. Very recently, we modified the apparatus in order
to measure total (single and double) ionisation cross sections. The simplest
comparison with theory is the ratio of single-to-double ionisation, as
a function of energy. This will be out first goal, but absolute cross section
measurements are also proposed, as a weak extraction field can collect
all the ions from the cold cesium target.
*See also: Schappe et al (2002) Adv. At. Mol. Opt. Phys. 48
357.
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