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Threshold effects in positron scattering from isoelectronic series of atoms and molecules

Machacek, Joshua; Buckman, Stephen; Sullivan, James

Description

The observation of features, often referred to as "Wigner cusps" in a scattering cross section at the opening of a new scattering channel has been widely reported in electron scattering, and has been attributed to strong coupling between the two scattering channels. Recently a series of cusps were observed in positron scattering from the noble gases [A. C. L. Jones, Phys. Rev. Lett. 105, 073201 (2010)10.1103/PhysRevLett.105.073201]. In this case, the strong opening of the positronium formation...[Show more]

dc.contributor.authorMachacek, Joshua
dc.contributor.authorBuckman, Stephen
dc.contributor.authorSullivan, James
dc.date.accessioned2015-12-13T22:32:34Z
dc.identifier.issn1050-2947
dc.identifier.urihttp://hdl.handle.net/1885/75623
dc.description.abstractThe observation of features, often referred to as "Wigner cusps" in a scattering cross section at the opening of a new scattering channel has been widely reported in electron scattering, and has been attributed to strong coupling between the two scattering channels. Recently a series of cusps were observed in positron scattering from the noble gases [A. C. L. Jones, Phys. Rev. Lett. 105, 073201 (2010)10.1103/PhysRevLett.105.073201]. In this case, the strong opening of the positronium formation cross section resulted in a cusplike feature, or bump, in the total elastic scattering cross section. The positronium formation channel is typically the largest partial scattering cross section in the region of the electronic excitation and ionization thresholds in most atoms and molecules, and it is plausible that similar features may exist in other atomic and molecular species. We have undertaken measurements of the isoelectronic targets of helium - H2, and neon - H2O, NH3, and CH4, in an effort to better understand the mechanisms leading to these threshold features.
dc.publisherAmerican Physical Society
dc.rightsAuthor/s retain copyright
dc.sourcePhysical Review A: Atomic, Molecular and Optical Physics
dc.titleThreshold effects in positron scattering from isoelectronic series of atoms and molecules
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume90
dc.date.issued2014
local.identifier.absfor020201 - Atomic and Molecular Physics
local.identifier.ariespublicationU3488905xPUB4706
local.type.statusPublished Version
local.contributor.affiliationMachacek, Joshua, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBuckman, Stephen, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSullivan, James, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue4
local.identifier.doi10.1103/PhysRevA.90.042703
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2015-12-11T09:08:35Z
local.identifier.scopusID2-s2.0-84907932559
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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