Low-energy positron-argon elastic scattering at 30°

Gao, Hui; Garner, A J; Moxom, J.; Laricchia, G.; Kövér, Á.

doi:10.1088/0953-4075/32/24/103

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…Other examples of elastic DCS experiments are the work of the Bielefeld group [177] and the UCL group [194], both of whom studied argon. The measurements of Floeder et al are notable in that the group established the absolute scale of their data by measuring and/or estimating all of the required experimental parameters.…”

Section: Differential Elastic Scattering Cross Sections the First Mea...mentioning

confidence: 99%

Low-energy positron interactions with atoms and molecules

Surko

Gribakin

Buckman

2005

J. Phys. B: At. Mol. Opt. Phys.

275

242

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This paper is a review of low-energy positron interactions with atoms and molecules. Processes of interest include elastic scattering, electronic and vibrational excitation, ionization, positronium formation and annihilation. An overview is presented of the currently available theoretical and experimental techniques to study these phenomena, including the use of trap-based positron beam sources to study collision processes with improved energy resolution. State-resolved measurements of electronic and vibrational excitation cross sections and measurement of annihilation rates in atoms and molecules as a function of incident positron energy are discussed. Where data are available, comparisons are made with analogous electron scattering cross sections. Resonance phenomena, common in electron scattering, appear to be less common in positron scattering. Possible exceptions include the sharp onsets of positron-impact electronic and vibrational excitation of selected molecules. Recent energy-resolved studies of positron annihilation in hydrocarbons containing more than a few carbon atoms provide direct evidence that vibrational Feshbach resonances underpin the anomalously large annihilation rates observed for many polyatomic species. We discuss open questions regarding this process in larger molecules, as well as positron annihilation in smaller molecules where the theoretical picture is less clear.

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Section: Differential Elastic Scattering Cross Sections the First Mea...mentioning

confidence: 99%

Low-energy positron interactions with atoms and molecules

Surko

Gribakin

Buckman

2005

J. Phys. B: At. Mol. Opt. Phys.

275

242

View full text Add to dashboard Cite

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The Scattering of Positrons and Positronium by Atomic Targets

Walters

Blackwood

McAlinden

New Directions in Antimatter Chemistry and Physics

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Positron scattering from atoms and molecules using a magnetized beam

et al. 2002

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The development of buffer-gas trapping and magnetized beam formation has provided positron beams with significantly improved energy resolution (⌬Eр0.025 eV) compared to those available previously. Analysis techniques have been developed to take advantage of the fact that the beam is in a magnetic field of ϳ0.1 T. This has enabled scattering experiments at lower energies and with significantly improved state selectivity for excitation experiments than had been possible previously. A detailed description of these techniques is presented. Data are presented for a variety of cross sections for scattering of positrons from atomic and molecular targets.

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Low-energy positron-argon elastic scattering at 30°

Cited by 3 publications

References 19 publications

Low-energy positron interactions with atoms and molecules

Low-energy positron interactions with atoms and molecules

The Scattering of Positrons and Positronium by Atomic Targets

Positron scattering from atoms and molecules using a magnetized beam

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