The kick-off of a large-scale European network
for research in 'Thermodynamics in the Quantum Regime' was celebrated
in Brussels on Tues 30 April 2013. The successful proposal for one of the prestigious COST
network grants, funded by the ESF, was led by UCL's researcher Dr Janet Anders.
Published: May 1, 2013 9:58:55 AM
In a recent STFC newsletter, UK news from CERN, Dr Stephen Hogan describes how he, and a team of international collaborators are investigating the properties of antimatter. The AEGIS experiment at the Antiproton Decelerator, in CERN has been designed to exploit techniques Stephen developed to accelerate antihydrogen atoms in excited states; to transport them and make beams suitable for measurements of the acceleration of antimatter in the Earth's gravitational field. More...
Published: Feb 14, 2013 12:14:34 PM
According to Wannier's law, when a single
photon is absorbed with energy just above the fragmentation threshold, the
electrons in a multi-electron atom break-up in the most symmetric way.
Published: Feb 11, 2013 3:47:22 PM
Positron-, Positronium-, and Electron-Collisions
The study collisions of particles with molecular targets is a core research activity within the AMOPP group. These studies reveal important fundamental details of collision physics of electrons, positrons and positronium with atoms, and small and large molecules.
Collisions of Positrons and Positronium with molecules (Prof Nella Laricchia and Prof Jonathan Tennyson)
Although still considered somewhat exotic particles, positrons (the
antiparticles of electrons) and positronium (the bound state of an
electron and a positron) are currently employed in the exploration of
fundamental effects ranging from condensed matter physics to
astrophysics as well as in the diagnostics of living biological systems
and of the electronic and structural properties of industrially
Our main research interests are in atomic physics problems where beams of positrons and positronium with speeds comparable to those of atomic electrons are contributing to the unravelling of general collision phenomena as well as illuminating specific interactions and processes such as exchange and annihilation. Current hot topics of research worldwide include positron-induced ion production (comprising ionization with and without Ps formation, annihilation, etc), positron impact excitation (vibrational and electronic) and positronium scattering. Measurements of differential ionization and positronium collisions are in their infancy. UCL is a pioneer in this type of research. You can read more about our work here.
Scattering of electrons from molecules (Prof Jonathan Tennyson)
The molecular physics group studies the scattering of electrons from diatomic and polyatomic molecules using the R-matrix method. Applications include fusion plasma modelling (see with workshop on Electron-molecule Collision Data for Modelling and Simulation of Plasma Processing in 1998) and applications in astrophysics. Scattering cross-sections are computed as well as bound state energies of N+1 electron systems.
Our work uses the UK molecular R-matrix code. The figure to the left illustrates the principle of the R-method. You can read more about our work here.