Browsing Department of Physics by Author "Choubisa, Rakesh"

Now showing items 1-20 of 28

Atomic and Molecular Physics: Introduction to Advanced Topic

Choubisa, Rakesh (Narosa Publishing House, 2012-01)

An integral route in the acquisition of knowledge in the field of theoretical Atomic Collision Physics. The book offers a broad yet comprehensive introduction to advanced topics of Atomic and Molecular Collision Physics, ...
Coplanar (e, 3e) differential cross-section of He atom

Choubisa, Rakesh (Springer, 2003-06)

We present in this paper the results of our calculation of five-fold differential cross-section (FDCS) for (e,3e) process on He atom in low momentum transfer and high electron impact energy in shake-off mechanism. The ...
Double ionization of helium by twisted electron beam

Choubisa, Rakesh (IOP, 2020-06)

In this communication, we report our calculations of the five-fold differential cross-section (FDCS) for (e,3e) on the He atom using both the plane wave and the twisted incident electron beam. The formalism has been developed ...
Dynamics of Twisted Electron Impact Ionization of CH4 and NH3 Molecule

Choubisa, Rakesh (MDPI, 2023-05)

Electron vortex beams (EVBs, also known as twisted electron beams) possess an intrinsic orbital angular momentum (OAM) with respect to their propagation direction. This intrinsic OAM represents a new degree of freedom that ...
(e,2e) Impact Ionization Processes for Surface Science

Choubisa, Rakesh (Springer, 2018-04)

We present a scattering theoretic approach to the calculation of the cross-section of (e,2e) impact spectroscopy where all the electrons involved are treated within the real space multiple scattering framework. This approach ...
Electron impact single ionization of hydrogen molecule by twisted electron beam

Choubisa, Rakesh (IOP, 2020-12)

In this communication, we present the results of the five-fold differential cross-section (5DCS) and triple differential cross-section (TDCS) for the (e, 2e) process on molecular hydrogen (H2) by the plane wave and the ...
Interference Effect in the Relativistic Inner Shell Ionization of Atoms by Electron Impact

Choubisa, Rakesh (JSPF, 2006)

We present in this paper, the results of our calculation of right-left asymmetry in the relativistic (e, 2e) processes for inner K-shell ionization of atoms. The calculation has been performed in plane wave Born ...
K-shell (e, 3e) processes with transversely spin-polarized relativistic electrons

Choubisa, Rakesh (IOP, 2012)

An ab-initio calculation of five fold differential cross section (FDCS) and transverse spin asymmetry in FDCS for the K-shell double ionization of atoms by transversely polarized incident electron is proposed.
Laser-assisted (e,2e) study with twisted electron beam on H-atom

Choubisa, Rakesh (ARXIV, 2023-08)

We study the laser-assisted twisted electron beam impact ionization of the hydrogen atom in coplanar asymmetric geometry. We develope the theoretical model in the first Born approximation. In the presence of the laser ...
Many body phenomenon within multiple scattering approach in PEELS

Choubisa, Rakesh (IOP, 2020)

Plasmon excitation within multiple scattering approach is being explored. The plasmon loss is described within the so-called quasi-boson approximation, originally proposed by Hedin and further extended by Fujikawa. We ...
Model dielectric functions for fluctuation potential calculations in electron gas: A critical assessment

Choubisa, Rakesh (APS, 2022-05)

In this article, we report on a critical assessment of dielectric function calculations in electron gas through the comparison of different modeling methods. This work is motivated by the fact that the dielectric function ...
MsSpec-DFM (Dielectric function module): Towards a multiple scattering approach to plasmon description

Choubisa, Rakesh (ARXIV, 2022-07)

We present here the MsSpec Dielectric Function module (MsSpec-DFM), which generates dielectric functions in an electron gas or a liquid, either isolated or embedded into an environment. In addition to standard models such ...
A Multiple Scattering Approach to the EELS Cross-Section

Choubisa, Rakesh (Springer, 2018-04)

We derive a general spherical wave multiple scattering expression of the EELS cross-section. Contrarily to most of the previous theoretical frameworks, this approach treats all the electrons involved on an equal footing ...
New geometry for the quasi-binary incident electron–centre of mass collision in (e, 3e) process on He

Choubisa, Rakesh (IOP, 2008-01)

We present in this paper the results of our calculation of five-fold differential cross sections (FDCS) in a new geometrical arrangement (constant theta-12-phi-12 mode) for the study of the quasi-binary incident electron–centre ...
On the effects of Orbital Angular Momentum (OAM) and impact parameters on (e, 2e) process on atoms by twisted electron

Choubisa, Rakesh (IOP, 2017)

We present our theoretical study of (e, 2e) process on atoms by the twisted electron, with special emphasis given on the effects of OAM and impact parameters on TDCS.
On the relativistic electron impact K-shell (e, (3-1)e) differential cross sections for atoms

Choubisa, Rakesh (IOP, 2015-01)

In this paper, we present the results of our calculation of four-fold differential cross section (4DCS) for the K-shell electron impact double ionization (DI) on various atoms in the relativistic energy regime. The 4DCS ...
On the spin interplay of the ejected electrons in the relativistic electron impact K-shell double ionization of atoms

Choubisa, Rakesh (IOP, 2013-09)

A detailed analysis on the spin aspects of the ejected electrons is presented for the electron impact K-shell double ionization of Ca, Mo and Xe atoms. The five-fold differential cross sections have been seperated in terms ...
Quasi-binary incident electron—centre of mass collision in (e, 3e) process on He and He-like ions

Choubisa, Rakesh (Springer, 2005-07)

We present in this communication the results of our first Born calculation in the three-Coulomb (3C) wave approach for the (e, 3e) process on He and He-like ions at an incident electron energy 5599 eV in the coplanar ...
Reply to the comment on 'New geometry for the quasi-binary incident electron–centre of mass collision in the (e, 3e) process on He'

Choubisa, Rakesh (IOP, 2008-10)

In this reply, we clarify our theoretical model used (the so-called 2CG model) in our recent paper (Choubisa and Sud 2008 J. Phys. B: At. Mol. Opt. Phys. 41 035202) and address the queries and comments raised by Dal ...
Revisit of (e,2e) & (e,3e) processes on atoms with twisted electron impact

Choubisa, Rakesh (IOP, 2020)

We compute Triple Differential Cross Section (TDCS) and Five-fold Differential Cross Section (FDCS) for (e,2e) & (e,3e) processes on atoms respectively to investigate the effects of non zero angular momentum and the apex ...

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