Dynamics of Twisted Electron Impact Ionization of CH4 and NH3 Molecule

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 provides new insights into investigating the dynamics of electron impact ioni...

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Bibliographic Details
Published in:Atoms 2023-05, Vol.11 (5), p.82
Main Authors: Dhankhar, Nikita, Neha, Choubisa, Rakesh
Format: Article
Language:English
Subjects:
(e, 2e) process
Ammonia
Angular momentum
Approximation
Born approximation
Electron beams
Electron impact
Electrons
Energy
EVB
Investigations
Ionization
Kinematics
Molecular orbitals
Molecular structure
OAM number
Physics
Plane waves
Spectrum analysis
superposed Bessel beams
TDCS
Vortices
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Summary: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 provides new insights into investigating the dynamics of electron impact ionization. In this communication, we present, in the first Born approximation (FBA), the angular profiles of the triple differential cross section (TDCS) for the (e, 2e) process on CH4 and NH3 molecular targets in the coplanar asymmetric geometry. We compare the TDCS of the EVB for different values of OAM number m with that of the plane wave. For a more realistic scenario, we investigate the average TDCS for macroscopic targets to explore the influence of the opening angle θp of the twisted electron beam on the TDCS. In addition, we also present the TDCS for the coherent superposition of two EVBs. The results demonstrate that the twisted (e, 2e) process retrieves the p-type character of the molecular orbitals, which is absent in the plane wave TDCS for the given kinematics. The results for the coherent superposition of two Bessel beams show the sensitivity of TDCS toward the OAM number m.
ISSN:2218-2004
2218-2004
DOI:10.3390/atoms11050082