Department of Physics

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Subject: search.filters.subject.Orbital angular momentum (OAM)

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    On the effects of Orbital Angular Momentum (OAM) and impact parameters on (e, 2e) process on atoms by twisted electron
    (IOP, 2017) Choubisa, Rakesh
    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.
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    Laser-assisted (e,2e) study with twisted electron beam on H-atom
    (ARXIV, 2023-08) Choubisa, Rakesh
    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 field, we treat the incident and scattered electrons as Volkov waves, the ejected electron, moving in the combined field of the laser and residual ion H + , is described by a Coulomb-Volkov wave function . In this communication, we compare the angular profile of triple differential cross-section (TDCS) for laser-assisted twisted electron beam incidence with the plane-wave, laser-assisted plane wave, and field-free twisted electron beam for (e,2e) processes, for different orbital angular momentum (OAM) number (m l ) values. We analyze the influence of the laser parameters (photon exchanged, intensity ) on the angular distribution of the TDCS. We study the (T DCS) av for macroscopic target to examine the effect of opening angle {\theta} p of the twisted electron beam on the angular profile of TDCS. Our results clearly show the impact of laser parameters (electric field ? and number of photon exchanged (l)) and twisted electron beam parameters (OAM number (m l ) and opening angle ({\theta} p )) on the angular distribution of TDCS.
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    Triple-differential cross section for the twisted-electron-impact ionization of the water molecule
    (APS, 2022-06) Choubisa, Rakesh
    In this paper, we present the results of the triple differential cross section (TDCS) for the (e, 2e) process on H2O molecule for the plane wave and the twisted electron beam impact. The formalism is developed in the first Born approximation. We describe the plane or twisted wave, plane wave, the linear combination of atomic orbitals (LCAO) (self-consistent field LCAO method), and Coulomb wave for the incident electron, scattered electron, the molecular state of H2O, and the ejected electron, respectively. We investigate the angular profiles of the TDCS for the outer orbitals 1b1, 3a1, 1b2, and 2a1 of the water molecule. We compare the angular profiles of the TDCS for the different values of orbital angular momentum (OAM) number m of the twisted electron beam with that of the plane wave beam. We also study the TDCS for macroscopic H2O target to explore the effect of opening angle θp of the twisted electron beam on the TDCS. Our results clearly show the effect of the twisted electron's OAM number (m) and the opening angle θp on the TDCS of the water molecule.