M K Srivastava
Articles written in Pramana – Journal of Physics
Volume 9 Issue 1 July 1977 pp 87-92 Atomic Physics
Glauber amplitudes for transitions from low lying states in hydrogen atom by charged particle impact
The Glauber amplitudes for the general transition
Volume 16 Issue 6 June 1981 pp 457-465 Atomic And Molecular Physics
Electron impact optical excitation of helium-like ions in Coulomb-Glauber approximation
S N Singh A N Tripathi M K Srivastava
The Coulomb-Glauber approximation is applied to evaluate the electron-impact excitation integrated cross sections for 1^{1}
Volume 17 Issue 2 August 1981 pp 197-201 Atomic And Molecular Physics
Total charge transfer cross-sections for protons colliding with hydrogen atom
Mohan Lal A N Tripathi M K Srivastava
Total charge transfer cross-sections for protons impinging on hydrogen has been calculated in Coulomb-projected Börn approximation. It is seen that the present calculation compares well with the available experimental data.
Volume 27 Issue 3 September 1986 pp 409-412 Atomic Physics
Higher-order effects in large-angle coplanar symmetric (
The triple differential cross-sections for the ionization of atomic hydrogen by fast electrons are considered in the case of a coplanar symmetric energy-sharing geometry. They are estimated in the modified Glauber (MG) approximation. It is found that MG results are significantly different from those in the second Born approximation only for 90°⩽
Volume 30 Issue 6 June 1988 pp 521-527 Atomic And Molecular Physics
Triple differential cross-sections for the ionization of helium by fast positrons are calculated in a ‘correlated’ first Born approximation supplemented by the inclusion of post-collision interaction effects. The results are analysed with respect to electron-helium experimental data of Jung and coworkers in coplanar asymmetric geometry.
Volume 31 Issue 4 October 1988 pp 263-271 Atomic Physics
Electron-sodium elastic scattering in the presence of strong non-resonant laser field
The elastic differential cross-section for
Volume 31 Issue 4 October 1988 pp 273-280 Atomic Physics
Triple differential cross-sections for the electron and positron impact ionization of atomic hydrogen and helium are calculated in a first order model using a product of two Coulomb wavefunctions for the final state continuum electrons supplemented by post-collision interaction effects.
Volume 31 Issue 5 November 1988 pp 357-363 Atomic And Molecular Physics
Triple differential cross-section for electron and positron impact ionization of hydrogen and helium are calculated by using the Glauber approximation along with post-collision interaction effects which are estimated classically. The present results are compared with the recent absolute data of Ehrhardt, Jung and coworkers for the electron impact case. The positron impact case is found to lead to a larger binary to recoil peak maxima ratio (compared to the electron impact case) which further increases when post-collision interaction effects are included.
Volume 32 Issue 1 January 1989 pp 33-38 Atomic Physics
Influence of the laser field polarization on the electron impact ionization of hydrogen
The triple differential cross-sections for the ionization of hydrogen by electron impact in the presence of a laser field have been calculated in the coplanar asymmetric geometry by using the first Born approximation and the symmetric geometry by using the Coulomb-Born approximation at an incident electron energy of 250 eV. The variation of the triple differential cross-sections, for fixed values of the angles of scattering and ejection, is studied as a function of the linear polarization of the laser field. The changes are quite amenable to experimental investigation.
Volume 47 Issue 1 July 1996 pp 79-85 Research Articles
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Simultaneous ionization and excitation of helium by electron impact is considered in an improved second Born approximation. The wave function of the low energy ejected electron is obtained in the field of residual He^{+} ion in 2s-state. The calculation has been done for the process
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