Home Research Courses Teaching






Here is a brief description of my Research Interests:

The focus of our research work is on studying the scattering of positrons (antiparticles of electrons) and electrons from various atoms and molecules. Atomic and molecular collision processes play important and significant role in aeronomy, astrophysics, combustion physics, plasma physics and a number of other areas. We calculate the cross sections for various scattering processes using a variety of theoretical techniques. The target systems under current investigation for calculating the cross sections include rare gas atoms, alkali atoms and light molecules. The atomic processes under consideration include elastic, inelastic (including ionization) and rearrangement collisions of electrons and positrons. In particular, we have also calculated, and compared with experiments, the cross sections for the ionization of inner shells of various atoms by impact of both positrons and electrons.

Other research interests include investigations of production of negative ions by the process of dissociative electron attachment to simple molecules. The rates of negative ion production by this process are strongly enhanced if the attaching molecule is initially rovibrationally excited. We have also calculated the cross sections for the vibrational excitation and dissociation of simple molecules by electron impact. For the calculations of cross sections for the processes of dissociative electron attachment, vibrational excitation and of dissociation, we use the non  local resonance theory that invokes the formation of the molecular anion resonant state as an intermediary. 

Various cross sections that we calculate are used for investigating the transport of charged particle swarms through various pure gases or gas mixtures. Using techniques that we have developed for obtaining exact numerical solutions of the Boltzmann equation we can compare the transport properties of electron swarms moving through a gaseous mixture subjected to external electric fields with the corresponding properties of positron swarms. Such comparative studies allow us to 'manufacture', on a computer, new gaseous materials which have predefined electron and positron transport properties.



Chapters Published and Editorships of Books/Proceedings
Journal Articles Published

Papers Published in Conference Proceedings