Ionization of Atomic Hydrogen by Low Energy Antiprotons

Lead Research Organisation: Queen's University of Belfast
Department Name: Sch of Mathematics and Physics


The cross section for electron removal or ionization of the simplest atom (hydrogen or its isotope deuterium), by antiprotons, is of currently of considerable interest. This is the simplest collision system for testing theory with only one active electron and, since the antiproton cannot capture an electron, the detection of a hydrogen ion in coincidence with an antiproton after the collision process is a signature of the ionization process. The antiproton hydrogen collision system is therefore an ideal system against which to test our theoretical understanding of the few-body Coulomb physics involved in ionization.Ionization is an important process in astrophysical and technological plasmas and in the dissociation of molecules in the Earth's atmosphere. Technological plasmas are increasingly used in industrial proceessing of materials, particularly to effect their surface properties and are widely used in the semiconductor industry. Energy from controlled plasma fusion of hydrogen isotopes presents us with the possibility of a 'clean' energy source to replace fossil fuels and to alleviate global warming resulting from carbon dioxide emissions from current generation power stations.Our understanding of the ionization mechanism in such a simple collision system should enable an important step forward in current theoretical models.


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Knudsen H (2009) On the double ionization of helium by very slow antiproton impact in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Description Univ of Swansea 
Organisation Swansea University
Country United Kingdom 
Sector Academic/University 
PI Contribution We worked together with Professor Charlton at CERN on the experimental project on antiproton collisions.
Collaborator Contribution Professor Charlton made a positive contribution to both the operation of the experiment and the discussions of the physics involved
Impact Deatils of all publications have been listed.
Start Year 2006
Description University of Arhus 
Organisation Aarhus University
Country Denmark 
Sector Academic/University 
Start Year 2009
Description University of Tokyo 
Organisation University of Tokyo
Country Japan 
Sector Academic/University 
Start Year 2009