Electron scattering at high momentum transfer from methane: Analysis of line shapes
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The measurement of the energy distribution of keV electrons backscattered elastically from molecules reveals one or more peaks. These peaks are at nonzero energy loss and have an intrinsic width. The usual interpretation of these measurements is attractively simple and assumes billiard-ball-type collisions between the electron and a specific atom in the molecule, and the scattering atom is assumed to behave as a free particle. The peak position is then related to the mass of the scattering...[Show more]
dc.contributor.author | Vos, Maarten | |
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dc.date.accessioned | 2015-12-10T03:15:09Z | |
dc.date.available | 2015-12-10T03:15:09Z | |
dc.identifier.issn | 0021-9606 | |
dc.identifier.uri | http://hdl.handle.net/1885/38469 | |
dc.description.abstract | The measurement of the energy distribution of keV electrons backscattered elastically from molecules reveals one or more peaks. These peaks are at nonzero energy loss and have an intrinsic width. The usual interpretation of these measurements is attractively simple and assumes billiard-ball-type collisions between the electron and a specific atom in the molecule, and the scattering atom is assumed to behave as a free particle. The peak position is then related to the mass of the scattering atom, and its width is a Compton profile of the momentum distribution of this atom in the molecule. Here we explore the limits of the validity of this picture for the case of electrons scattering from methane. The biggest discrepancy is found for electrons scattering from carbon. For electrons scattering from hydrogen the effects are substantial at relatively low incoming energies and appear to decrease with increasing momentum transfer. The discrepancy is analyzed in terms of the force the atom experiences near the equilibrium position. | |
dc.description.sponsorship | The research was made possible by funding from the Australian Research Council. | |
dc.publisher | American Institute of Physics (AIP) | |
dc.rights | http://www.sherpa.ac.uk/romeo/issn/0021-9606..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 10/12/15). Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in The Journal of Chemical Physics and may be found at https://doi.org/10.1063/1.3319765 | |
dc.source | The Journal of Chemical Physics | |
dc.subject | Keywords: Back-scattered; Ball-type; Compton profiles; Energy distributions; Energy loss; Equilibrium positions; Free particles; Incoming energy; Line shape; Momentum distributions; Peak position; Atoms; Electron energy loss spectroscopy; Electron scattering; Energ | |
dc.title | Electron scattering at high momentum transfer from methane: Analysis of line shapes | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 132 | |
dc.date.issued | 2010-02-18 | |
local.identifier.absfor | 020201 | |
local.identifier.ariespublication | u4860843xPUB3 | |
local.publisher.url | https://www.aip.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Vos, Maarten, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Atomic and Molecular Physics Laboratories, The Australian National University | |
local.identifier.essn | 1089-7690 | |
local.bibliographicCitation.issue | 7 | |
local.bibliographicCitation.startpage | 074306 | |
local.bibliographicCitation.lastpage | 9 | |
local.identifier.doi | 10.1063/1.3319765 | |
local.identifier.absseo | 970102 | |
dc.date.updated | 2016-02-24T11:24:37Z | |
local.identifier.scopusID | 2-s2.0-77149163026 | |
local.identifier.thomsonID | 000274756000019 | |
Collections | ANU Research Publications |
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