Campeanu, Radu

Radu Campeanu

Full Professor
Ph.D. (London)
campeanu@yorku.ca

Department(s): School of Information Technology

Office: 3059 Victor Phillip Dahdaleh Building (DB)
Phone: (416)736-2100 ext. 30105

Research Fields
Atomic, Molecular and Optical Physics

Graduate Program Appointment
Full Member: Eligible to supervise M.Sc. or Ph.D.

Research Types
Computational, Theoretical


Research specialization
Atomic and molecular collisions, especially involving positrons.


In recent years, the availability of intense positron beams allowed for an increase in the number of ionization experiments. The first experiments, which studied noble gases, were followed by measurements of the ionization cross sections for other atoms and molecules and for triple differential cross section measurements. Our work uses various theoretical models to reproduce the existing experimental cross sections. For the calculation of the total ionization cross sections of atoms and molecules, we have explored the use of distorted-wave models, containing a realistic description of the final state of the system and including distortion and polarization effects. Recently, we expanded our work to the study of the electron-capture-in-the-continuum (ECC) phenomenon in positron impact ionization of helium and molecular hydrogen. We employed a 3C theoretical model in representing the final state of the ionization system, which allowed us to obtain good agreement with the existing "triple differential cross section" experiments.