B N Roy
Articles written in Pramana – Journal of Physics
Volume 27 Issue 6 December 1986 pp 795-802 Nuclear Physics
Alpha particle and deuteron impact
Volume 34 Issue 5 May 1990 pp 447-460
K- and L-shell ionization cross sections of gold due to impact of proton and alpha particles have been calculated in the binary encounter approximation incorporating the effects of Coulomb deflection of the projectile, of increase in binding of the target electron, and of polarization and relativity. Relativistic Hartree-Fock-Roothaan (RHFR) momentum distributions for the target electron along with an approximate relativistic correction to the collision dynamics have been used in the present calculations. A comparison with the corresponding calculations using non-relativistic Hartree-Fock-Roothaan wave functions, experimental results and other available calculations is presented.
Volume 35 Issue 5 November 1990 pp 485-493
Volume 36 Issue 3 March 1991 pp 325-334
The binary encounter approximation has been used for calculations of electron impact single ionization cross-sections for F, Cl, Br and I and double ionization cross-sections for Br and I. Contributions of ionization from inner shells have also been included in the calculations. Hartree-Fock momentum distribution has been used for the bound electron as far as possible. The results have been found to be in satisfactory agreement with experimental observations.
Volume 38 Issue 1 January 1992 pp 77-90
We have calculated total and differential cross-sections for 1
Volume 40 Issue 4 April 1993 pp 321-327
We have investigated the contribution of excitation-autoionization to the electron impact ionization of Zn+ and Ga+ using the binary encounter approximation. Hartree-Fock velocity distributions for the bound electrons have been used throughout the calculations of direct and indirect ionization cross-sections. The calculated cross-sections are in good agreement with recent experiments. We have also compared our results with other theoretical calculations.
Volume 43 Issue 2 August 1994 pp 169-174
Electron impact double ionization cross-sections for Ba and Ba+ have been calculated in the binary encounter approximation. Hartree-Fock velocity distribution has been used for the first ejected electron and a hydrogenic velocity distribution for the second. For Ba+ the focusing effects of the target ion on the incident electron have been incorporated in the calculations. Contributions from ionization-autoionization to the ionization cross-sections, as observed in experiments, have been included in the present work. The calculated results show structures as observed in recent experiments.
Volume 44 Issue 6 June 1995 pp 563-568
The binary encounter approximation has been used to investigate the effect of charge state of the target atom (ion) on the electron impact excitation autoionization cross-sections. Roothan-Hartree-Fock (RHF) velocity distribution for the bound electrons has been used through-out the calculations. The present results give a good account of the experimental observations.
Volume 55 Issue 3 September 2000 pp 447-453 Research Articles
Electron impact single ionization cross sections of copper have been calculated in the binary encounter approximation using accurate expression for
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